Looks like an
ATW▸ 175 - those things seem to have a bit of a habit of catching fire. One did it at
Prestatyn in 2009, and it's going back a while but I think one of the Adelentes (180 105?), a closely-related design, barbecued itself in reasonably spectacular style near Swindon.
Edited to addYes, it was 105 that caught fire,
back in 2007.