I never knew that they also made the Black Star stuff, I've had some of their gear and I wasn't TBH particularly impressed with them, however the gear I now have, I'm very impressed with. I have a 1905a and I really like that but it doesnt get used as much as it should do and that is purely down to being spoilt with my other meters being auto-rangers.
According to this website http://www.azurelectronics.com/Black%20Star%20Stack.htm TTi bought Black Star in 1999.
As to whether they continued to make anything under that brand afterwards, idk, though the 1905a uses the Black Star standard case and buttons. All I do know is, when I needed a service manual for my 4503, TTi was where I had to go, and they were very helpful indeed.
Since you like the 1905a, I'd say if you see a 1906 for sensible money, jump at the chance; it's effectively an updated 1905a with autoranging and 4-wire measurement added. I paid something like £60 shipped, and it pretty much keeps up with my Fluke 8840.
They've sent the Army in here to help with the flooding, which may be necessary given that some of the scaffolding on the £30m flood defence project got partially washed away last week, and they haven't managed to repair it yet!
Yeah, I'm keeping my options open on getting a 1906, it would be handy to have a continuity tester on a bench meter I must admit, but I remember seeing it demonstrated on a video somewhere and that feature sucks on it, which TBH, I'm amazed at considering how they managed to get everything else about right. TTi continued to use that style of case for some time. I have the 1905a, TGP110, TG120 and the CM200, all of which use the same style of case with the exception that the CM200 does not have middle infill panels. The 1905a is from their brown period, the CM200 and TG120 are from the grey era and TGP110 is from their current cream period as is my TF930.
Are you affected by the flooding or are not one of those directly affected? When I was a child and indeed even in my teens I remember we used to have county wide, river authorities who always kept them dredged and the natural flood barriers in good order, and we never had flooding like we do now. Perhaps they should reinstate these authorities, they worked well.