Gee, brain fade, you expect a visual approach when you're number 7??? keep taking the pills, why don't you.
As already explained, a visual can only be offered when requested unless it's on the ATIS as the promulgated approach. Secondly, a visual approach allows a pilot to fly anywhere he damn well pleases and EVERY controller has cleared someone for a visual expecting him to turn straight towards 5 mile final, only to have him fly "all over Scotland" of his own accord, as is his right on a visual approach. Thirdly, if you've number 7, and we require 6 miles between succeeding aircraft on final, that's a minimum of 42 flying miles IF you're flying at 160 knots like the ones on final. Given that you're probably passing FL150 at 300 knots, the choice is to slow you down till it hurts or to vector you around the sky for a bit.
Finally, you may think you have a right to be cleared for a visual over Selkirk to nip in ahead of everyone else, but the multiple separation losses that would result would be on ATC's head. If you're number 7, do exactly what the controller says without whinging and you'll get on the ground quicker. Hell, if you were number 7 for a runway at my current place of work, you'd be at 210 kts from 35 miles out, and you'd probably fly the STAR to downwind and be on downwind for 20 miles at 180 kts.
Rant over.