Thank you for the welcome! I thought it'd be the best vacuum line to Tee into, but I was unsure, not played with vacuum on the engine before, but everything else I have!
Looking forward to getting some better mileage out of my corsa, its a shame I had to sell my 2.0 HDi peugeot, I could get 62mpg on a good run with that. the corsa cant come close!