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@cheesedisease
Cheers, was considering this...
I did measure with digital calipers, but the tube at the top is a bit out of round. Then averaged the measurements to try to get the size right.
Think I'm going to try to get a cheapy 26.4 or 26.6 from Bike Recycling place and make sure of the size. The 26.8mm goes in fine at the top, but I think it may be 'spreading' the tube a bit. Seems less keen to go in when about as deep as where the seat stays meet the seat tube. This, plus tightening down the collar and measuring now makes me think it's maybe for a smaller post than first thought. Being filet brazed with no lug at top of seat tube, I think I must have made the mistake of measuring without the seat collar on to compress the tube a little. If that makes sense!??? I'm used to there being a lug there doing that a bit!