Thanks for the replies and advice on manual targeting. I'll see how I get on with WO assistance and then hopefully progress to doing it all myself. 
Nemo
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"I'm afraid there is no disguising the fact that King's obsession with the Pacific and the Battle of Washington cost us dear in the Battle of the Atlantic".
Sir John Slessor GCB, DSO, MC, DL
AOC-in-C Coastal Command RAF
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