Thanks so much for your replies. Eden the bikes are ancient beyond belief, but the saddles do come out on long posts. Whether or not I can get something to swap and fit I don't know, but I will have a look at that possibility.Kiwi, unfortunately I am not allocated my own bike, I just have to use the one that belongs to whichever round I am doing. I work part time, so do different ones every day pretty much.Hebe, regarding Health and Safety, it shocks me that we are all expected to use the regulation Royal Mail fits all saddle, but then we wear the fits all uniform too and that doesn't take into account women's body shape either. I am seriously wondering how the other women posties cope and am going to have to raise this with the few other ladies I work with, although it might explain just why there are so few of us! Thanks to all for the links and suggestions, I will let you know how I get on and please if anyone else has any ideas do let me know.