Thanks for your further thoughts. I do have ECMDroid and find it very useful.
I like the idea of Cooters - put a valve in the fuel block - then in future very easy to test.
I will also make up a fuel pressure test kit as a useful thing and when I have it anyone else in the UK is welcome to pop around to me and use it - I am in West Sussex - near Goodwood race track.
The bike has no way of measuring fuel pressure - other than the consequences of too much/little via only the O2 sensor. So if I have the connector for hooking into the fuel supply hose at intake end - I could just feed fuel to it at 50psi from another source and it bike runs fine then another way to test/prove if the Buells own supply (pump/filter etc) is duff or not?
Back to the workshop to keep on with the testing...