Yup, haven't wrecked my leg but am 55... I am sure you will get there. As you have probably worked out, it's a confidence thing. On my inlines I have the option of trailing the toe wheel of my free leg as a comfort blanket, but you'll no doubt have a toepick...
£24 an hour, that's amazing. I don't like to pry, but did you have to do a risk assessment or anything like that? Was it just you? Feel free to tell me to mind my own business, but if I could find somewhere like that I would happily fund it and invite up to 5 friends to skate with me - at £4 each it would be a bargain.