Wow, there are a few pretty nasty throwbacks among some of the posters that would have gleefully pinned scarlet letters on 'fallen' women. That vociferous group tends to react like that any time there is some post relating to sex work. OP is a mature woman who has probably a lot more life experience than some of the younger sex workers. Not everyone feels revolted and some women have higher sex drives. I have met quite a few mature escorts that told me that they were treated a damn side more respectful by their clients than when having unpaid sexual encounters. OP's decision is far from unique and strange. Many mature escorts start in their late 30s to 50s. They tend to research, advertise and treat it as a business. Many have no childhood trauma nor did they spiral.
Working alone as an escort is totally legal and those women aren't without rights, therefore if someone tries to avoid paying etc, sex workers have the same right to take legal recourse.
There has been a steady demand for mature escorts for a number of decades and probably even longer. It is a niche market and the vast majority are much younger or perpetually 27. But there quite a few older escorts, some are even in their 80s. Sheila Vogel-Coupe was one of the UK's oldest sex workers and was one of the busiest of her agency who specialised on older sex workers. The clientele included a number of younger guys.
The idea that it is so demeaning that women ought to do barely minimum wage jobs back to back, rather than making an informed decision to work a few hours instead, is ridiculous. It is not for everyone but some are quite comfortable doing it. Among the slightly older sex workers, many have a nursing background who are burned out from their work. Others have for example, a lot on their plate with children with a disability, which really stops them from a well paying position and real chance of a career. Sex work for an intelligent woman can pay pretty well. Quite a few older women earn significantly more than young girls, as they attract a richer clientele who look for different encounter. The sliding scale of rates is not so dissimilar from someone working at a secretary level all the way to an executive assistant.
As for the pay, £140 for an hour is mid to slightly lower level, although prices in real terms have gone down but obviously also depends on where. In some smaller towns, demand can be quite a bit higher. Like 20 years ago the going rate in central London was between £140 yo £250 an hour. And as mentioned before, some of the mature escorts charged the most. There is demand for all sorts of sex workers, including rather large women.
The only reason I could not do it is due to not being able to be charming or nice to people for more than a short time.