Hi,
ABH has been exported to UK as well, so it would be just a matter of patience. An ABH was auctioned two weeks ago south of London - for _really_ little money (the whole V8, not only the engine). PTs are seen as well from time to time.
If you have the change to get a PT and make a plug and play switch, I'd vote for that. Changes are way higher that you have your V8 back on the streets in near future. Alternatively, if you are still up to an ABH, look at germanautoconnection.com - they have detailed descriptions on how to switch from PT to ABH. But I'd never go for that if I can have the same engine with no troubles.
Bastian