I wasn't heartbroken, since I already have a lifetime's worth of projects in my shed, but this frame has an interesting feature that sets it apart.At first glance this looks like a lugged Fleur de Lis frame like my '69 Gillott, but the seat cluster tells a different story.
Instead of using a lug, a fleur de lis patterned sleeve is brazed to the end of the top tube, which is then fillet brazed to the seattube.
The headlugs are made in the same way, with an obvious fillet when compared to the lugged Fleur de Lis models on the Classic Lightweights UK Readers Bikes page.
This style of building was used by a number of English builders during the 40's and 50's, notably Paris Cycles, and Claud Butler who called the process 'bilamination'.
Later, Tom Ritchey used the same process on some of his top-end MTB and road frames as in this photo from the Bob Brown Cycles blog.
Photos: Alexander von Tutschek, ebay auction #260182570977