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@EPR
Hey there! Thanks for the reply, and no worries :)
It just means measured centre to centre rather than centre to top. Which is from the middle of the bottom bracket shell to where the centres of the seattube/toptube would intersect - the A2 measurement in this figure, rather than A1. Usually only a difference of 1-2cm! If I could also trouble you for the top tube measurement (B in the figure) that'd be great
http://www.womenscycling.ca/blog/wp-content/uploads/2010/08/bike-sizing.gif
Hope that made sense, sorry in advance if it didn't. And thanks!