Can anyone help to identify this frame?

It looks like a Calfee, an American brand.

Greg Lemond road these with Z

Those look something like the cheapo Chinese carbon frames that used be sold as white label jobs 5-10 years ago. They used to have those distinctive 'webs'.

I'm not sure I remember them as lugged though - thought they were monocoques.

Try someone like Guy at Pearsons. I'm pretty sure they used to sell them before they really got their own brand in to gear.

Hi Ultimatecycles. I cannot specifically identify the frame but judging by the reinforcement of the triangular webs on the bottom bracket shell and the style of the lugs - I would guess that it was built for some rough riding such as Cyclocross.

Have you had a word with Thorn Cycles ( SJS ) from Bridgewater,Somerset.

It looks a little like a Belt & Braces job that they are known for when building/specifying frame building for specific working duties.

never seen lugs like that .... try posting on retrobike road .... they may be able to help
you too

Errr good luck shifting them on Gumtree with a bit of dodgy provenance.

Just don't ask me to help.

I think it's safe to say that we can identify this one as a part of the two wheel variety, known internationally as a bicycle, discounting any unicycles or tricycles.