>>>> I'd even suggest that the tmaEds would be doing their viewers a big favour if 'Clava Cairn' were added as a separate sub-category of cairn
Good idea Hob! I'd support that. There are, tops, 70 sites which could be classed as a Clava cairn (with a passage grave or just a cairn) which must be more than the numbers in many of the existing categories. (How many platform cairns do we have??)
At a rough guess, I'd say up to half of these are already on TMA - but these will be the best preserved ones most would want to visit.