Ah! Never twigged it could be 1983, the numbering system kicked in 1973 but I initially thought that it was a miss stamped 8 for 1978.
Those lugs with the teardrop holes started in the late 70's and appeared on a whole range of Raleigh/Carlton frames, including the Rapide which I mistook for a Corsair.
I think you might have trouble nailing the exact frame, especially if someone has filled holes and removed eyelets etc.....
Shaun