Normally £1 but once I gave £5 
That was because when DD tooth fell out she was so excited about the tooth fairy and went to bed as normal. I would usually creep in the night and put it under pillow while she was asleep and I only just bloody well forgot! My poor DD was so upset and the next day I realised I only had a £5 note on me and thought I can't let her down twice, £5 it is
her eyes lit up at that