I have finally cracked and put DS1 back in nappies. He was just weeing all over the place and not telling me til after it was done. We managed just two successful potty attempts in 3 days. He's not ready.
I feel more relaxed now he has nappy and trousers on. We can start doing stuff again instead of hanging round the house me waiting for the next mop outing. There's a little tinge of disappointment though 
Oh well, try again next month I suppose...