Sorry to drag this thread up again but it is for a good reason.
Firstly, thanks to all the kind people that took the time to answer in such depth, it was really appreciated.
I have really persevered, ignored my partner and son nagging at me about riding my bike! In fact at weekends, I was hiding my bike clothes on a Friday night, then sneaking off early on a Saturday morning for a ride, knowing when I got back my partner would still be asleep.........lol
Eight weeks ago, I could only ride 2 miles max!
Last week, Tuesday, Friday and Saturday it totalled over 81 miles and most of it off road!
YAY..................that was such a result for me. This peak flow thingy does not change from the maximum of 340, generally 320 but I don't care, I can ride my bike again and it's fantastic.
Thanks again for all the encouragement and excellent advice.
Clock