special needs 3 wheeler/all terrain pushchair suit 5yrs

I am desperately looking for a 3 wheeler pushchair for my 5 yr old child who is unable to walk. Wheelchairs do not go round the forest/on the beach too well!!. I am looking for an all terrain pushchair which must have 3 wheels (swivel prefered but i'm not that fussy!). I am willing to pay postage and a reasonable price. We live near Chester so can pick up around that area and a little further beyond. One desperate Mum!!!!