I need, urgently to get a mitre box or (non-electric) saw to cut some
large plaster coving mitres. I need to cut arbitrary angled mitres,
not just 90 degrees and I have to be able to cut larger coving (184mm
and even larger). Most compound mitre saws don't have a large enough
box for this. Something like this would be ideal, but bigger:

http://www.screwfix.com/app/sfd/cat/...19927&ts=06349

Any suggestions? I have a specific date to do this and won't have time
to make a custom mitre box or anything - I just need to buy a tool
(not electric) and do it ...

PK