My employer has always been really accomodating and over the years I have had a variety of contracts and hours.
I was promoted 2yrs ago and was job sharing, wen my job share left I was asked if I could increase my days - I did to 4.
I've now been offered a move to a really exciting project but the offer came with 'of course if you could go to five days that would be fantastic - no pressure but give it some thought'.
Makes me really cross, I alreay do 5 days work in 4 days but its always an issue that I'm PT