Thanks Stephen - have had it idling on petrol for the last 20-30 minutes now out the front (walking out the door as I type this) - no steam whatsoever, and none when I give it a punch (and seems to be running fine - responsive etc) ...

Fingers crossed - here goes ... thanks to everyone for your input/thoughts. Chat in a few days (unless it goes to poo up the road, and hence I'll be sitting here on my pat and will be back on in a couple of hours!!! LOL).