Thanks Peter,
Retiring at 61 was entirely my decision and not enforced, if it wasn't my choice I may have felt less positive about it. I know that I definitely wasn't ready at 55.
I have been working 4 days a week for the last 9 months and actively passing my duties on to other people, so now I've kind of made myself superfluous

I have said that if I get bored I'd look at doing some work for charities but was warned that I may find myself taking on as much as I was doing in my own business. That's not what I want to do at all so I'll have to be careful of that.
My elder sister retired at 60 with the intention of getting a 2 or 3 days a week job, but 5 years down the road she never has, because she hasn't got the time!
Only time will tell for me of course.