27.0 are quite hard to find these days - cheap Tioga ones were available last time I looked for £15, otherwise Thomson make one for £65. They also sell like hot cakes on ebay - I guess because of limited availablity.
Number 36 seems to fit your bill.
(36) KALLOY with RITCHEY TYPE HEAD 27.0mm 295mm rails to limit mark **NEW & UNUSED** a light & secure easy to adjust post £12
I was in Decathlon yesterday looking for a post, and they do one that comes with a shim to fit a range of diameters - I think 27mm was one of them (but check!). It cost nine quid.
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