Did a bit of homework. Appears that only those prisoners who are working in the community are entitled to the minumum wage. See this link (2005 info):
http://www.ilpa.org.uk/briefings/IAN2005BriefNC2Rep.doc
also
http://pso.hmprisonservice.gov.uk/PS...soners_pay.doc
There is an emphasis on purposeful activity, which is certainly something I would support. Minimum pay for in-prision work is GBP 4/week. Not a lot!
Frankly, I believe that any restitution to victims should be set by the judge at sentencing or, alternatively, through civil proceedings.
In any case, enjoy the links. Much better to work with the facts at hand!