These bikes normally had Simplex DRs.
The Seller lists " Brakes Front/Rear: Weinmann Center pulls MAFAC Racer" brakes. Likely he means the LEVERS are Weinmanns (probably original) and the calipers are Mafac (replaced).

I don't trust the serial number given by the seller. (Too many digits after "NA" (Nottingham, January, xxxxxx) )
I would guess it's really an early 70's GP