Yet another frame identification help, please!

Timmo

Retro Newbie
First post. Lifelong bike rider and fettler, now aged 71 and too much time on my hands. A friend fancied a project and bought himself a Carlton to restore, and it turns out the vendor had a second bike for sale, which got me enthused, so I bought it. I'd like to try and find out more about it before I start restoring it.

Looks to be decent quality frame, interesting seat post cluster, takes a 27.2 seat post so I'm assuming 531 of some flavour. 53cm top tube, 51cm seat tube c to c. BSA BB. The bare frame weighs 1.95 kg, so about average? Not especially close clearance, brazing looks decent, No branding on the dropouts. Oddly, mudguard eyes on the forks but not rear dropouts. Can't see any identification marks or serial numbers anywhere. Bike was repainted by Argos at some time (sticker on seat tube). So, any clues to maker?

A real hatch patch of fitted components:

Campagnolo Record Strada chainset 50/41 rings
Campagnolo 980 rear mech (1983 version)
Campagnolo front mech (980 again?)
Simplex friction gear levers
Unidentified but high quality cartridge BB, like Mavic but not Mavic.
Shimano 600EX Arabesque (HP-6200) headset.
Shaimno 600EX (BL-6200) brake levers
Dia Campe N500 brake callipers
Cinelli 1A stem + 65 bars
Unidentified alum seat post
Unknown hubs, Rigida rime, chrome spokes 36/36 (rear axle broken
Campagnolo (F) and Maillard (R) QR skewers

Anyone got any thoughts on who might have built it?

Do I rebuild with Campagnolo or Shimano 600? (I'm favouring the latter!)

Thanks in advance.
 

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Unusual but tidy BB cable guides and a pic of the cartridge BB. Anyone able to identify it?
 

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Argos might have notes using the frame number as reference?

Looks like a mavic bb has met with a Drillium Enthusiast, but hopefully I'm wrong
 
Argos might have notes using the frame number as reference?

Looks like a mavic bb has met with a Drillium Enthusiast, but hopefully I'm wrong
Sadly no frame number. "Midnight Blue" is written on the fork steer, other than that, nothing else.
 
Send them a picture, they might remember.
The writing is possibly recognisable as a staff member, the colour should narrow it down.
You could always offer to pay for the time spent investigating?
 
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