I recall my nearest good bike shop being EG Bates in Plaistow in East London...and they had a wall full of TI Raleigh frames (red, yellow and black liveryincluding those built at Ilkeston (SBDU)...so 753, 531SL and 531d/b (before 531c).
Now if I had a time machine...I would go back to EG Bates (long closed) and buy all their TI Raleigh frames....make mint....Then I could not afford a Campagnolo headset!