Hi. To add to the point about Walsh Walsh linking to Whitefriars, we know that the two companies collaborated in their lighting department in the late 1940s, and when Walsh Walsh closed in 1950 is it likely that some of the workers moved to Whitefriars. It was only in 1951 that Whitefriars started to produce any quantity of millefiori paperweights, with the '1951 Triplex' examples. It is also reported that a New England dealer bought two crates of millefiori items from Wealdstone around 1950, some with '1848' dates, and took these back to sell in the USA. My guess is that these were unsold stock from Walsh Walsh. It was these items that were sold in the USA as 'antique Whitefriars', giving rise to that enduring myth.
There are one or two unusual bottles around which are probably from Whitefriars, but with input from Walsh Walsh workers(I referred to this in another thread, and promised images - here they are). The reason I suggest that mixture is that some of the canes in the bottle appear to have been made in the moulds that were later used for the canes in the 1951 Triplex and 1953 EIIR paperweights, rather than typical Walsh Walsh moulds, yet there are, in the base of the bottle, canes with '7/6' centres. I suspect these were made at Whitefriars by ex Walsh Walsh workers.
My bottle has a foot, and the outer row of canes is pulled under slightly - but it does not have the typical Whitefriars button base.