Thanks for your details, it's like buses, nothing for ages, then three at once (-:
tech549, yes, a 1938. This was a bad year for Westfield sales, which is evidenced by the frame manfacturing dates being all over the place when it came to completing the bikes. Your frame was made May 1938 (E5), but the surviving bicycles I have listed preceding yours, C87255, and following, C103097, were both E10, frames made in October 1938, so your frame was in stock for at least five months before being built up, between October and December 1938.
SKPC, a nice build from a bare frame. A 1935 bike coinciding with the start of Bluebird production Bluebird frame numbers surround this frame number. There is a May 1935 made frame about 5000 before this, so I guess yours was built up between June to late 1935. Please do you have the other code, stamped above the frame number, which would say when the frame was made? It's likely to be between B3 and B9?
Brutuskend, the frame code C10 says the frame was made October 1936, and built up before year end (a Christmas bicycle?). This too was surrounded by Bluebird and Robin serial numbers.
Again, Thanks for the help, I appreciate it. I have added them to the new lisrt for when it comes out.