Dear John Mark,
The SOC digest has been going for quite some time now and it is run internationally by SOC members all over the world,particularly in India and USA. The best website is Margoneetho (the Pearl) Syriac Orthodox Resources.
As to how many Syriac Orthodox Christians there are in Britain, that is difficult to estimate - HE Bishop Athanasios Touma would know exactly -
but there are between 100 - 200 SOC families in the UK, about 90% of whom are refugees from Iraq. I also personally know SOC members from Tur Abdin, the Lebanon, and Jerusalem.
I am happy that the two articles I recommended have caused such interest and thought.