Generally speaking I would say it not a great value wage for the amount of work done. The managers are human some of them are good, some of them are bad some of them treat you like crap, that however is the same in all company's. That being said if your applying to a pub in which has high food sales then the job becomes a lot simpler as you will most likely be put on a station. I.E stand by the fryers put the food in which is on the screen, chips, fish, chicken strips etc. You could be by the microwaves putting food in passing it to the person who is plating up.
You would most probably start doing the dish's while learning the menu, help out with deserts and pass w/e the cookline staff need over. If however you have applied to a kitchen with low food sales, then I have to admit your going to have your hands full. In a lot of small food pub there is a good chance you could be on your own for entire shifts (after your trained), this generally means breaks only happen if you have someone cross trained or its quiet, it also means your entirely responsible for the kitchen regardless of position. If EHO walk in and its a mess you lose stars and you will be blamed, if the area manager walks in and finds it a mess you will be blamed, if you've been busy and not completed the am/pm tasks you will be blamed, if the daily prep tasks are not complete you will be blamed, if the dlmb is not filled in you will be blamed.or you've missed a signature you will be blamed, if there is a food item missing of the delivery and you didn't notice you will be blamed.
That being said if you like a challenge and want a job with good progression prospects then wetherspoons is a good comany, if however your just looking for a job to get by I would not recommend it. If you look at the majority of management in wetherspoons their almost entirely stressed half the time, this is because the company if putting higher targets on pubs while reducing the hours available.
As a company their is a shortage in capable kitchen staff, as there not many stupid people who want to live a life of stress for a "average" wage, with a "chance" of bonus if EVERYTHING go's well. That means if the area manager doesn't find anything to mark you down on a few times a month, i.e that poster is in the wrong place, behind the grill under the place you cant see needs cleaning, is that some dirt i see far away on the canopy. It also go's of food sales which you cant influence and bar/kitchen stocks.
That being said you could easily become a kitchen manager in the company within a few years if you learn the sops, take control of shifts, work with speed and keep in good terms with the managers. Just becareful as any mistake generally ends up with a PAP - Performance Action Plan or a disciplinary.
For tips I would suggest listening to what the person is telling you, ask questions you are unsure of while their with you. It get's busy and they wont always have time to give you instructions use your head. if your doing dish's and you see the person cooking struggling in between dish washer cycles pop on over ask them if they need any food going on, do they need anything passing. When its dead ask them if any prep needs doing, if any am/pm jobs need doing, wipe down the sides when your not busy, empty the bins, stock up the freezers, brush, make sure food which is opened is day dotted and put in the right place. When they see that your actually looking around asking for work they will love it, as any simpleton can stand their and do dish's till told otherwise.