Thought this was the better place to post the result
After deciding it was worth a shot, I spent a nice morning in the sun Stripping & Cleaning a couple my Spare injectors .
Stripped , parts spent a while in Brake cleaner in my ultrasonic cleaner, polished odd varnishy bits .
Number 2 injector came out quite easily , did soak them all in penetrating oil before the IOW hols
popped a spare in place of the dodgy one .
And leakback looks a lot better ,
Ran the leakback for the same 57 secs and number 2 gone from the full pot to this . result !!
Even seems to start better although was always very good .but that might be wishful thinking
.
C