Posted: 23/02/2014 at 07:56
.... You could always work with it and create a bog garden, plenty of wildflowers like marsh marigold enjoy damp conditions. What sort of wildlife are you hoping to attract? I found it so rewarding last year watching the bees, butterflies and hoverflies on our plants where before there had been gravel, grasses and paving.
That's my first thought - work with the conditions you've got - I'd love a bog garden but our soil is very free draining - maybe we always want a little of what we've not got? But there are loads of gorgeous native British flowers that just love to have their feet in boggy dampness - purple loosestrife, yellow flag, ragged robin, marsh marigold, meadowsweet, forgetmenots, cuckoo flower and of course the snake's head fritillary needs damp meadow-type conditions to naturalise in, as do the native primulas.
But if there's something you particularly want that needs a free draining area then I'd create a slope with some stone or similar underneath to aid drainage - I'd probably look at instructions on how to build a rockery - alpine plants need free draining soil so that's why they work so well on a rockery.