Can you help to identify these frames, bikes or parts?

Hi guys, there are some strong clues here, but none that I'm able to identify, I'd really appreciate the hive's thoughts.

1. This frame has Allez rear ends - "Allez" products were sold by Holdsworth, but ends ?? If anyone says Specialized they can go straight to the naughty step ;-)
   
2. The capped semi wrapover seatstays are unusual.
   
3. It's very light, at least 531, I suspect a higher number
   
4. A tiny heart shaped boss under the downtube to secure the shifter strap.
   
5. Canti mounts and a solid drilled boss on the brake bridge.
   
   

The paint is rattle can, so the frame could have been modded in it's history - maybe the original coat is under there and I should have a scratch.

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