Maz, you were quite correct. Found another hose running up into the regulator. Jubilee clip had a bit of slack, so after managing to get the screwdriver at the right angle tightened it up. Had her running now for over five minutes and no sign of the leak!! Engine bay still smells of petrol but hope that will go in time.
The throttle response is significantly improved as well, as with this leak it kind of hesitated before revving.
Hopefully this has solved the problem, really appreciate the assistance in this, owe you one!!. Thought I might have had to drive the Yaris to work tomorrow!!
Thanks again,
Jon