Thanks for the replies, all welcome! I started it yesterday and had a little upset tummy they first time, but today all seems fine. I have it one a day for the first week, then twice, to be taken with meals.
I'm on co-codomol for a pain problem long term so that can cause constipation, that actually seems to have eased today so maybe it will be OK with that. Going to check in with the doctors in one month and see how it's going.
Yes they were quite keen to send me to tier 3 weight management and for injectables as my BMI is close to 40 (embarrassing) but said it would take forever and asked me if I had considered them privately but I can't really afford them right now, not for months anyway.
I will see how it goes and report back. Best of luck to everyone. Oh and please keep posting if anyone would like to!