I still haven’t been to the site, but it should still be pretty impressive. A two page report (PDF document) on the barrow is available via the ‘Magic’ website, at magic.gov.uk/rsm/22826.pdf
The report suggests that apart from the chamber, the rest is still there – a mound 60m long, 25m wide and 2.5m high, retained by a dry stone wall. It says that “despite disturbance of the site, the Fair Toot long barrow survives comparatively well”.
It is a Scheduled Ancient Monument, on the national monument register as ‘22826’, and is described as “The Fairy Toot long barrow 350m SSW of Howgrove Farm”.
The full 8 figure grid ref is ST52056179.