could be carbolite but seems to have a microadjust seatpost so it probably isnt, which makes it worth a bit more. still not £250. it seems very mismatched which also doesn't warrant that price. I'd probably pay £150 purely for the sake that it saves the effort of doing your own conversion if you can't be arsed. otherwise , take the £250 and build yourself a much much better one.
could be carbolite but seems to have a microadjust seatpost so it probably isnt, which makes it worth a bit more. still not £250. it seems very mismatched which also doesn't warrant that price. I'd probably pay £150 purely for the sake that it saves the effort of doing your own conversion if you can't be arsed. otherwise , take the £250 and build yourself a much much better one.