Brilliant!
Thanks for the heads up guys, this weekend I shall be mostly shopping...
Google came up with this site which has a good tip on it:
https://forums.24hoursoflemons.com/viewtopic.php?id=11259
And if you have the same 78 Cutlass Supreme 260V8 as me than here is the short cut:
http://www.rockauto.com/RSS/vehiclefeeds.php?carcode=1222063&m=wc&l=en&html=true
(okay, I guess it's the same as the RSS feed that Bonne wagon said)
I shopped at Rockauto before and even with the shipping it's way cheaper (and often quicker delivery) than buying from here in the UK.
E.g. that Felpro oil pan gasket for $3 or $4 is £30