Developed from Rosenthal, this is what I call the three spirals pattern. Not very imaginative.

It is found on these chargers and on Bullet bowls.
I'm never terribly sure if they're supposed to be round or have three corners.

It's much easier for a glassmaker to put a set pattern of trails on something than to try to produce a really good random design.
Good random is difficult and it requires innate artistic abilty and flair to make something that looks good. Anybody can follow a set pattern.

I have a very large "Beaked vase", the same shape as the Whitefriars ones, but much bigger, with this pattern on. So I'm pretty sure Boffo was involved.
I have only ever seen this one beaked vase. I do not know of any others at all.
I don't know if this was produced during Harris' time there or not. But I do think one of my bullet might be his work. It was certainly produced during the Boffo period. (Which obviously, overlaps the Harris period) I don't think it went on after that, or certainly not for long.
More info and piccies here.
https://www.glassmessages.com/index.php/topic,45315.msg316786.html#msg316786