Yep seat post states 25.48mm so gas pipe indeed - not that I'm bothered. Seat and seat post came off nice and easy and are being cleaned up now. Both brakes are seized up and not moving, the front is off and first for a good clean up - I'll keep adding pics to my flickr stream as I go along.
The bars and stem are fantastic - a few little knocks and scrapes but such a fantastic shape to them... the stem is stamped Cinelli Milano and the bars are Cinelli Criterium 65-42.
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Having seen a bit more of it, it's obvious it'll never be back to showroom condition so the aim is to clean, lubricate, replace cables and make everything work so I can ride it lots!