Jimbo, I have a complete S2 VVC160 head lying here unused in case it turns out that's a cheaper route to repair than replacing valves/valve guides - I was going to get it made into a solid cam conversion but my plans changed.
VVC is a fiddly beast - I suspect you'll have bent some valves. If AA will trailer to MMC that's likely to be easiest route to getting it replaced properly and without causing more damage (there have been numerous botched VVC rebuilds).
Alternately you can strip your head, replace any bent valves and then rebuild with new oil stem seals - I don't think that should be all that expensive, if a little time consuming. It's not that bad a DIY job, though you need to pay attention to a lot of details or you will make your problem worse - so not good for your first spannering job
Given your statements about finances I wouldn't spend time/money at this stage on getting any head work.
Cheers,
Robin