Steve, thanks for replying....I haven't yet anything UTA in my I tended to concentrate on more CIE territory, before switching to things 009 and Austrian!
I had some original transfers some years ago and from memory they were about 12 inches width - 14 as suggested a hive might be about right. I gave my transfers to the RPSI and DCDR so I can't look them up now.
Quite a few published photos, in particular of "jeeps", would give a better idea than I can.
I commend you on issuing anything UTA at all, as it's a minority interest, despite some extremely interesting operations, locos, lines and rolling stock having come under their watch (initially at any rate, before they hastily closed most!).
In terms of sizes, the UTA used standard sizes of both their original roundel and their later crest, on all things railway and buses alike.