It was the Silver that had me confused for a minute....then I remembered the Carlton Professonal came in the team colour, Silver Lustre
I had a quick look at the Cycling mags I have at the time but none from 1979 but from 1978 here are a few frame price guides..give or take a few quid
Carlton 531 main tube (Clubman, Curette) £42
Carlton Professional, silver lustre inc campag head set £91
Raleigh 531 team frame £107
Raleigh 753 TT frame £135
Raleigh 753 road frame (26 week delivery) £155
Alan £160
Viner Stellar (what I wanted) £168
Saba (Ian Hallam jobby) £170
As you can see the Carlton Professional was the mirror of the Raleigh team frame but in different colours / chrome.
HTH
Shaun