Hello Pete - don't think you ever explained the reason why you believe your four E. & L. glasses were from 1929 - to me it sounds a tall order to be able to pin the manufacturing date to one particular year - but for all I know maybe you have the original receipt
Looking again at Woodward's book, he states that E. & L. became part of Webb's in 1921, and in view of Barbara's email comments to you, she thinks it is 'probable' that all of the E. & L. patterns, from that date until possibly 1964 when Crown House bcame involved, would be in the Thomas Webb pattern books. This may be so, and would be a quite logical assumption, but I'm not that clued up to know - we need someone with far more knowledge.
These two factories were some distance apart - Stourbridge and Edinburgh - but record keeping was usually thorough, although I assume the pattern books were kept at Stourbridge.
I'm unsure from Barbara's other comments, if she is suggesting that the Webb archives are currently with Wedwood Waterford - I think you'd have to ask the lady if she can be more specific on that matter.
As we've said, running these patterns down can be very time consuming and often fruitless. Probably fair to say there have been more individual drinking glass patterns produced than any other type of glass ware - if you take the last three hundred years say. Looking just at the better known names that can sometimes be found on glasses - Webb, E. & L., Edinburgh, Stuart, Webb Corbett, Tudor, Walsh, Royal Doulton - you'd probably need a few lifetimes to get anywhere half serious with pinning them down.
Agree with you, cut glass can be beautiful and desireable - unfortunately few people here seem to collect.