Posted: 24/02/2014 at 16:32
Ask at your local garden centre if you can put a "wanted help" advertisement up? They may know of a local company that is reputable who could help.
Failing that do you have a local horticultural type college where students may be looking for some extra cash / a garden with which to use as part of their studies ?
(Then get yourself on the waiting list for an allotment!!)