Frog or Toad?

Today's the day ......................... to ask the experts

Spent a bit of time today clearing out my Dad's greenhouse. It had suffered a fair bit of damage in the gales a few months ago - and quite a few of the panes of glass had got broken. Now though, it's all back in good shape and it just needed a bit of tidying up inside.

Came across this chap who had been hiding under one of the slabs until I disturbed him/her. I would like to know whether it's a frog or a toad and I'm hoping that one of you experts out there (brokenbanjo or gladders to mention just two) will be able to put me right ..........................?