sced,

Yes, would be helpful to have a pic of BB serial as well as know your best estimate for when frame was built, so as to aid with serial projections.

As said, this "69" number points to a ''shop" frame rather than factory. Do you in fact remember corresponding with the WF Holdsworth, Putney shop as opposed to factory?

Definitely getting ahead of things here, but If the BB bracket numbers are neither along BB edge nor vertically oriented as in my BB example above, but rather horizontal as you describe - in that case we have previously theorized that it is still from the "shop", but probably built by an outside builder for the trade. (Kilgariff says; "Charlie Roberts and Alec Bird at unclear times"). In Dave's Excel data there is a frame K69357R that also looks like a Cronometro TT bike and serial numbers are oriented horizontally.