damascus, your gun is of the lot made exclusively for export into the UK, as it doesn't have sling swivels. The stock is is the best the factory could do, and in fact is times better than what's seen on gun sold in the USSR.
The crack through the wrist on these guns usually means someone didn't watch out for the crossbolt; one has to see if it's tight now and then. Izh12 is essentially the same action as the currently produced MP27, and many parts will fit, but not the stock; if you decide you're going to need a new stock check these out
http://www.oborontech.ru/index.php?categoryID=49http://prikladov.ru/price/priklad-cevie/priklad-i-cevie-izh-12/I don't know for sure if sending one of those to the UK is possible, but I can't see why not. They'll probably require precision fitting to place.
Don't hesitate to ask if you've got any questions.
