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@Scilly.Suffolk
That's nice! Those lugs and the wrap-over seat stays point to a it being of decent quality.
Track ends, bottle cage mounts and top tube cable guides indicate it's a "path racer": a type of bike designed to be ridden both on the track (path) and road (racer).
As the bottom bracket shell is 68mm wide, it's British/ISO threaded and will almost certainly take a 1" threaded headset: it's the external diameter of the fork steerer that determines which headset is needed.
Considering all the above, I think it's a British built frameset dating from the mid-Fifties to mid-Sixties.
If I'm correct, then it will be built from Reynolds 531. 531 came in various flavours, but I think it is most likely to take a 27.2mm, 27.0mm or 26.4mm seat post: get some Vernier calipers, digital ones can be had for a fiver off eBay.
Again, if I'm correct, it will also have been built for 27" wheels. You could use modern 700c/622 wheels and fill up the gap with bigger tyres.
There are no good quality 27" wheels available to buy new (that I know of), or even rims to have wheels built and pretty much the only nice tyres are Panaracer Pasela. Period wheelsets are available readily enough and often quite cheap, but that only applies to wheels that take a freewheel: fixed wheels of the period tend to be scarcer and more expensive.
Which wheels you use, also affects your choice of brake: if you use 700c/622 wheels, then you will need brakes with a long drop, as 27" wheels are bigger and the rim is closer to the brake.
The brakes also need to be the single pivot type, not modern dual pivot. It's easy enough to adapt the forks to take dual pivot brakes, but the rear is more of a problem. Either way, dual pivot brakes could look out of place and spoil the look if you are doing a build sympathetic to the period.
It would be worth doing a little research: I don't think it would be difficult to identify the builder. What's the frame number: check the underside of the bottom bracket shell, the fork steerer and the rear fork ends.
@Ecobeard @anidel, @Rik_Van_Looy or @7VEN (amongst others) might know what it is just from the photos. If you could take some more of the bottom bracket shell, the brake bridge, the fork crown and the track ends, that would be helpful.