I got a set of drain rods I can lend you.
First get your Marigolds on and stick your hand down and see if the trap is blocked with silt or rubbish.
Thanks for the offer Yorkie but I've already tried it and even hired a cable drain rod but it didn't work. The problem is with a blocked gully and drainpipe that I can't access because it has had decking put over the gully. :rage:
Thanks Hollins, I'll give them a go tomorrow. I've spent the last half hour brushing the water away and now I'm whacked!