Mature (34) debating going down the route of an Electrical Apprenticeship

I have been weighing up the idea for some time now and find myself getting cold feet but at the same time I am a little bored career wise. I have a boring job but at the same time I have been working the same job over 10 years, I get paid £35k per year before bonuses etc and I have a mortgage. I am in a good place, however I am looking at changing my career with an Electrical Apprenticeship, I would at best earn around £20k in the first year but when qualified I should be on around £45k per year. The option is there to go down this route, I have avoided taking the plunge for 2 or 3 years with my current employer.
Aside from the desire that is there, I will learn a valuable trade that always seems to be in demand as well as upskilling myself but I just can't see past the negatives. Has anyone on here gone down this route or are similarly thinking of taking on an apprenticeship at this age?
Is it worth taking a lower wage for 4 years and only a pay increase of around £10k per year?
Is it worth the loss in wages and contributions to my pension that I'll likely be unable to upkeep?
Is it a huge risk taking on the apprenticeship, as in job security?
Decisions, decisions!

I would recommend that if you do pursue that route, that you find a very good employer. I.e., one that has the time and budget to invest in your development, has a proven track record of successful apprentice development, and also the prestige to elevate your CV.

The training provider has a good reputation and my employer is a worldwide company in food manufacture. There are very few options to me within my location, this seems like my only option unless I could relocate. I think I understood that the apprenticeship is self driven, I could complete this in a shorter time frame or if this was the case could I undertake other training? They do send employees on courses and on site training but only ever over 2 to 4 days.
My current job is good if not boring, I think I would gain more transferable skills with the apprenticeship and development in the future. The only way I see my current job developing is if I relocated and got lucky.

You wouldn’t be able to complete it in less time unless you’re able to evidence prior learning. To be eligible for funding you’d need to retain 20% of new learning. Though, the employer would likely want someone to do the full scheme. If you already had a relevant degree, you’d be better applying to their graduate scheme.
You’re required to do 20% of your apprenticeship training off the job, which isn’t fully covered by university. Hopefully they’d have you doing relevant external training, send you to conferences and conventions, and other stuff.