Can we draw a line under this (if you'll excuse the pun) and get back to talking about contours?
It was other members that wished to try and instruct me in the niceties of grammar and punctuation on forums, with no wish on my part to get drawn into it.
The contour lines appear to be at 100 ft intervals. There appear to be two different heights shown on the maps: spot heights and peak heights, with peak heights sometimes being well outside the limits of the contour band that they appear in.
The shadings don't appear to uniformly change at certain contour boundaries, with wider ranges of heights getting the same colour at lower elevations.
From what I can see, the contour-interval on Bartholomew's maps is variable, and has two differing sequences depending on wether you are looking at an England & Wales or a Scottish sheet.
For most E & W sheets (except 28 & 31) the interval appears to be 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1250, 1250, 1500, 1750, 2000, 2250, 2500, 2750, 3000, 3250 and 3500. However sheets 28 (Merseyside) and 31 (N Lancashire) have an additional 25' contour, which doesn't seem to appear on any other lowland sheets. (I'd have thought the Lincolnshire/Fenland sheets would show it)
E & W are mainly grass-green for 0-100', then two lighter shades for 100-200', then 200-400', followed by pale orange for 400-600' then gradually darker shades of brown to 2000', then grey for 2000-3250' and white for everything higher than 3250'.
Scotland is another sequence altogether - it apprars to be 100, 250, 500, 750 than every 250' to 4250' however the legend differs from the E & W sheets - it's marked 0-100' (grass-green), 100-250' (light green), 250-500' (very light green), then every 250' up to 2000' in progressively darker shades of brown, then 2000-3250' in shades of grey and finally 3250-4250' which is white. (I'd have thought 4000' and above ought to be shades of light purple really) The Scottish sheets, from what I can see, have no 50' contour line.
My original question doesn't refer to the spot or peak heights, but the actual labels along the contour-lines themselves indicating which height they are, and this is where Bartholomew appears to be so inconsistent!