@Whatapalavaa - re going part time - yes, it's not the best decision financially but I would much rather have time than money. I earn enough to cover my share of the mortgage and bills and have enough left over for holidays and days out (albeit not extravagant ones) but that suits me fine.
My hobbies and interests are largely cheap - getting into the outdoors, running, hiking, cycling, reading and now I feel I have the time (and, crucially, energy) to indulge these, without sacraficing everything for work.
In terms of the pension - there's no denying it will be less. But I think you only get one life and I would rather live it to its fullest while I still have it. I might not make it to old age and, if I don't, at least I haven't spent my time working.
If I do, I will have a small pension and will cut my cloth accordingly as I will have done throughout my life.
Working part time as I do (21 hours a week) feels so manageable that I feel I could do it forever if need be. I am not counting down the days to retirement any more (I am 39...) because I feel that if I needed to I could carry on having this set up forever.