I think we are not told anything about b1 on diagnosis because it's all still in the study stage...And the amounts of supplement are really rather large, so just taking any old supplement is as good as nothing I imagine. I think that the medics are waiting for firmer evidence, as is the case with so many things...However, I think we are getting closer ourselves to taking B1 on board.
I don't know how much digging around you've done, but we did a great deal upon E's diagnosis, and discovered *many* potential factors in his treatment...such as the potential preservation of beta cells via very good control in the honeymoon phase, etc.
I'm American and through a close friend we contacting someone very high up in pediatric diabetes in the US, and it's clear that there the approach to treatment is generally quite different: literally all of her patients go almost straight onto a pump with a continuous glucose monitor, because the greatest control is afforded with a pump, and there is anecdotal evidence to show that good early control may help with stability later in a diabetic's life. There are also well funded trials now which are working hard to slow down the auto-immune effect in the honeymoon stage, which do show that there is greater control therefore for the first two years at least...There is one happening at Cambridge now, actually. ANYWAY, we decided against these trials in the long run, but the whole thing made us aware that being proactive was really the way to go through this. We are therefore pushing hard for a pump for E through our local primary care trust. Everyone agrees that pumps and CGMs are actually the best way forward, but the funding just isn't there.
That aside, sites: there *is* a children with diabetes uk site, which is interesting but mainly concerned with primary age kids and dealing with schools, but the emails forums are very active. I've also recently joined tudiabetes.com, which uses US figures (I think, btw, that you divide US numbers by 18 in order to get equiv UK mmols!?), but is a very active and interesting place. I'm unsure if there are distinct parent areas of that site (it's more like a social networking place), but am waiting to hear back from the administrator on that...
Long answer, sorry! Best.