We're going to a wedding this summer and can't take the DCs. We have a fabulous nanny and I was thinking of asking her to come and stay at our house from Sat-Sunday lunchtime to look after them. We pay her gross salary so aren't used to talking about paying her £x per hour. (She works about 50 hours/week over 4 days incl one weeknight babysitting and has every Friday off and is paid £28K). I was thinking of offering her the Monday off and some extra cash - but how much should I offer? My worry is that she will agree to do it anyway and I don't want to be taking the piss and have no idea what's normal in these circs.