I make notes of what I have looked at, but the problem is they are all on 'bits of paper' this is what I need to organise and write out properly and then put in their particular part of my folders. That's a good point about re checking databases as well. I looked for an ancestor on familysearch a number of years ago now and it wasn't there, but only this year it was found by a fellow rootschat. The thing is I didn't realise that particular website was updated, so it does pay to go back.
Ewan