Nadine,

Do you have an allotment society near you they may be interested in paid work, try the council offices for information. While your there ask if there is a food development officer who you can speak to. Part of their role may be to help develop gardens such as yours.

You could also try advertising it through local shops and such like, if you got someone very local i'm sure they would be more interested in their work (do you know what i mean? i'm not insulting people that don't live locally that may apply)

What about the residents of the place you are chair? Any of them fancy doing it?

You could also try a google search for allotment/food development initiatives and maybe they could offer more help.

Good luck.