Richard took the head to a local machine shop today, its booked in for crack testing initially before any work it done on it. Should be done by Tuesday!
Also got some "Just Orange" degreaser from Cromwell.co.uk:
http://www.cromwell.co.uk/SOL7272800A 1ltr
http://www.cromwell.co.uk/SOL7272810B 5ltr
Supposed to be some of the best degreaser there is! Had a bit of a start on the first set of valves. The exhaust ones are really badly caked, intake not so bad! Just orange, ultrasonic cleaner and a brass wire brush are cleaning up the rockers nicely!