Garden/play area designer?

[piedpiper9]

Hi all,
We're looking to do some work in our garden, its quite varied though - ideally I'd like to get one part to be really child friendly with astro turf or similar so that can play out in all weathers, with a big play area etc. also need a shed of some sort creating in a space under some stairs, some flagging and actual gardening work - an area of the lawn is always boggy so needs some drainage. ideally I'd like to just use one firm who is recommended to come and do everything!
help please!
x