My most recent eBay purchase showed up today. (I seldom bid on eBay any more since shipping costs to Canadaare prohibitive...)
Rickster from GG & GJ had listed this very nice set of small BA wrenches for working on the "electrics" of the vintage British bike I still threaten to buy.
They appeared safely wrapped in the bomb-proof packaging for which Rick is so well known:

The set has seen little use over the years as BA is essentially a long-obsolete standard. Spear & Jackson only acquired Bedford in 1972, and BA & Whitworth was obsolete then, so the condition shouldn't be a huge surprise!

BA sizes are in reverse order. That is, the higher the number, the smaller the size. Here is the smallest size in the set - a BA6 - which is 4.9mm:

BA sizes were actually available down to BA12...
These small ignition wrenches were the last BA/Whitworth tools I was looking for & I think I can now safely say I am fully-equipped!