We dug trenches....soakaways....got a gardener in....did some ourselves....all hopeless. The water sat happily on top of the 'drained' lawn!
So eventually I thought - what the hell! - hire a mini digger and dig the whole lot up.
So, over a fantastic weekend, me and my 8 year old son took turns in digging out a metre of clay from all of our lawn, dumping it into a skip, and then backfilling the whole area with tons of limestone gravel, topsoil and sand. In the evenings I continued the work with a glass of real ale in the cab.
Best fun we ever had. It cost me 3 days' mini digger hire, a couple of skips full of gravel and soil, a crate of ales and some turf. I replaced 50 square metres of lawn.
And it has been dry as a bone since then!!