When I do lots of walking I cut my background insulin (levimer for me) by two units from 16 to 14 because I often go low at night otherwise.
I also reduce my quick acting insulin (novo rapid) but 20%. But I still have hypo problems, so I think it needs to be more.
What I would say is this: my diabetic nurse told me that you can always give more insulin, but you can't take it away. Give yourself less novo rapid, definitely. And the only real way to do it is by trial and error. If you go low one day give yourself less the next. Keep testing. Best of luck.
Thank you that makes sense,
what do you usually eat for breakfast before you go, never sure whether to load up with carbs or totally avoid them?