I think it is an elswick
I had one back in the day
swapped it 'thankfully as it had cotterpin cranks' at hayes track in 1983
for a 75 mongoose - or the one with a lower gusset - for years thought it was an ammoco
got home asme day broke bike apart, resprayed frame dark blue and in my haste to re assemble and ride, left a lois corduroy wet paint mark in the top tube