Nice one mate - and it takes a lot to p*ss me off! (see the 'What Annoyed Today' thread!)
As for the hand-pump Vs Engine pump, that one I'll leave down to you! However, personally, I'd go with the hand-pump, especially as the flare rack is fitted, unless you can discover more evidence of the later pump on this machine, or serial block.
Might be worth asking the question over at 'The Spitfire Site' (may be Spitfire Page - can't remember!).