I depends on if you were wanting parts that were available in 1948.
The 1952 Brown Bros catalogue shows the rapid development in the immediate post-war period and is of limited value by itself.
With respect to realsteel, the above list of makers provided is all too vague (models are very important if you are wanting to get it right), and many were not yet designed let alone manufactured in 1948. (GB Coureur brakes, Campagnolo GS rear derailleur)
Also, many of the Reader's Bikes on Classic Lightweight's show the varying attention to detail. Also, I have found inconsistencies in Velobase.
A road going fixed gear set up as a time trial bike may be what the frame was initially used for. Or it could have been set up with gears as a massed start. The two styles of racing were in fierce competition.
Hilary Stone wrote that Condor only started in the autumn of 1948, so your frame is a very early one. Who dated it for you?
If you look through the
catalogues for 1948 at the V-CC library, you will notice that many frame makers did not specify the components to go onto the frame. This was partly due to shortages, the priority to exports to generate income, and to avoid the massive sales tax on complete bikes.
The
Holdsworth Aids to Happy Cycling began again postwar in 1949 (prepared in late 1948) so useful for you.
Classic Lightweights has wonderful material, go through the site and you will stumble over articles like this
Jim Case - Paris - East London CC
I bought a few of the Show Guide editions of the 'Cycling' and the November 17, 1948 edition is about the best I can do. The majority of manufactures were represented, showcasing their latest developments.
After the extensive research I decided on the following for my 1948 build:
GB Maes bars, GB Spearpoint stem, GB Hiduminium 'Standard' brake levers and callipers, Chater Lea 'round arm' chainset, Phillips '333' pedals, GB stainless steel toeclips (yes I know they are later, I have a NIB set of the GB Hiduminium toe clips), Simplex TDF rear derailleur and lever 3 speed, Reynolds 1/8"chain, Airlite 'Continental' hubs (32/40) with Dunlop Stainless Special Lightweight rims, GB wingnuts, Dunlop cable bands, Simplex dual handlebar mount bottle cage, alloy ribbed bottles with corks, Pennine CO2 pump (first version). Original saddle frame recovered with a new leather top, original domed steel seatpost, original TDC bottom bracket and headset. I also had some reproduction Shockstop 'honking rubbers' made for the brake levers.
It took me about 4 years of searching to get the parts. So patience is good, and you will be rewarded.
When do we see photos of your project?