I haven't been able to learn much about Abilita, They were built in Sturminster Newton in Dorset in the late 80s and early 90s by a guy name Paul Wilkin or Wilkins who also owned a bike shop, Pauls Cycle Services.
He was evidently no mug, you had to have a licence from Reynolds to build with 753
I think that's a delta brake on the front of your cougar, they are worth a fair amount of money on their own....