Do you mind those old fashioned oval roasting tins with the dimpled lids ?
Morrisons had them in for under a tenner, made from stainless steel. That would work well to keep it cooking long and slow and moist.
Basic times are 20 minutes per pound and 20 minutes just because
, but as Roe Ring recommends, the oven and long and slow and well wrapped up and it'll be excellent. HWMBLT doesn't like his meat pink, he likes it cooked and juicy and tasty and not cheugh, so his venison gets cooked that way too.
cheers,
Toddy
p.s. sorry, forgot to add, oven at 180degC for the 20 minutes per pound.