Career options for UK Dog Groomer leaving profession?

Hi, i am 40 years old, and I am a dog groomer. I have successfully managed two different salons, and I am currently helping to set up a second salon for my current boss. I have gotten to the point where is no more progression for me in this profession. I can't make anymore money unless I open my own salon. I did that many years before and never want to do it again. I am also seeing my body slowly break down from the work.

I am living in England, and I am a British citizen. My highest education is an American high school diploma. I did attend a two year college(USA) but didn't finish, and I dont have any transcripts from that.

I would like to retrain in something that will give my kids a better and more financially stable life. Im not against going back to school. It would just have to work around me working. I just didn't know what to retrain as.

I would appreciate any and all help. Thank you