Ok, so grades-wise do you stand a shot at vet med if you at minimum resit your chemistry to an A? Yes, as long as you also have the correct GCSE grades - they are important too. Ideally geography to an A too then it opens most doors. You will not be able to apply to Edinburgh and Glasgow as they don't accept resits. Liverpool raise their offer from AAA to A*AA if you resit. I'm unsure on Cambridge's exact resit/grade rules. But that would still leave you with plenty unis you meet the grade requirements for. You certainly can take 2 gap years and apply in October 2024 instead without it looking bad - there are people from all walks of life on the course and this scenario isn't too uncommon, I'd say a great % of students take at least 1 gap year.
But the work experience is a big issue. To be harsh, you don't know if you want to do vet med until you've done the work experience. It is just as important as the grades and if you don't meet each uni's individual requirements it will be an instant rejection, and tbh getting more than the minimum of varied work experience is important to 1 figure out you actually want to be a vet, 2 I think it shows more motivation to become a vet and 3 it is essentially what most of the forms and interviews talk about so you need to do it to have things to discuss and convince the admissions team that you'd be a good fit for a vet student. Honestly, there are what 6 weeks until 15th October deadline? And as you are resitting independently, if you really pushed for it, you could get the 4 weeks minimum (usually 2 weeks with a vet and 2 weeks general husbandry) most unis have by that time. 35 hours = 1 week - you can easily do more than 35 hours in 1 actual week if you push for it.
Start contacting everyone you can right now - vet clinics it may be very short notice but a lot of both vet med and pre-vet students can only do their placements until mid/end September, so you may be in luck as they may have the 2/3 weeks prior to the October deadline free. Don't bother emailing, call every vet clinic in your area, and also outside of your area - be willing to travel further than you'd normally, utilise staying at any family or friends' houses, maybe see if you can get cheap B&B somewhere - it is only a sacrifice for 2 weeks. Look up Fb groups which may advertise placements. And get at least 1 week more (assuming your stables was within the last 18 months) of husbandry - ask the stables to come back or search up different businesses in your area and call them. Look up dog groomers, kennels, catteries, shelters, petting zoos, dairy/beef/pig/poultry farms, other stables. You could even do 5-day placements Mon-Fri and then a Saturday at another place every week up until the deadline. Make sure to get your references in
Surrey's guide way so that's not an issue later on. If you get on it right away I do think 4 weeks between now and 15th October isn't impossible if you really wanted it. Not ideal, but not impossible, and then you'll be sure if the career is actually for you.
If for whatever reason you can't secure the work experience by that point, that's fine too, you can do the plan of not applying this year to focus on getting the grades and work experience by next October. That is a good plan. I presume you'll have a lot of time around revising for exams if you are doing it independently, i.e. not limited to holidays? In which case you have loads of work experience you can plan. Even though it's less of a rush, places are more likely to give a positive answer if you call rather than email so I'd stick to that. I'd try get 2 weeks at 2 different clinics (can be both smallies as large animals is a bit harder to get), and then as much varied husbandry as you feel necessary. I'd definitely get a week or two of lambing in Spring, use
the National Sheep Association website when it opens in November, a lot of farmers offer meals and free accommodation so you don't have to be near a farm. Lambing really prepares you for the realities of long hours, bad weather, possibly aggy farmers and all the fluids, smells, situations, deaths etc. You already have stables but just make sure you have the reference and it is within the 18 month application deadline - another week of it wouldn't hurt. Dairy and/or beef cattle is a good one to get in too - Fb may have links (the lambing club etc may be open to you enquiring about calving placements too). Some smallies husbandry like kennels, shelters, catteries, dog groomers etc would be good too. Keep a diary and link what you see and learn to how it makes you a good vet student, e.g. the traits like empathy, organisation, team working, observation etc. Look into doing some MOOCs like Nottingham's 'Virtual Work Experience' on FutureLearn or EdiVet courses on Coursera, they are free and not a subsitute for real work experience imo but don't hurt to get some extra insight into the career.
I'd also get a table going of the different vet med unis (not too many) and their GCSE, A Level and work experience requirements, so you know not to apply in vain anywhere. If in doubt about anything, you can always contact the admissions teams. You can also note the way they do their admissions, i.e. their different form and interview styles, and figure out if you think one suits you better as it may help to apply to your strengths - many don't get in on their first application cycle (I didn't, took a gap year, got 1 offer second time round but I am a vet student now so that's all that matters).
If vet med is for you, chase it, you'll get there eventually and it doesn't matter how long it takes. But do figure it out first - it isn't for the faint of heart, the salary isn't as amazing as the general public think, there is a high suicide and dropout rate with a lot of stressors like difficult owners, making life or death choices sometimes based on the owner's financial situation, pressure of people think you are just money grabbing etc. It's a long and intensive course followed by a stressful career to get into without giving it proper thought as a pre-vet student, definitely not one to look at through rose-tinted glasses which is why work experience is so key. Best of luck and I'm happy to answer any questions