As always I use this as one of the ways to keep an eye on the overall health of the denomination. This is not always an easy thing to do, but it's still worth trying.
The preface says that there are 173 Unitarian congregations in Great Britain, which is one up on last year (172). But I can't work out where the new congregation has come from. The breakdown in the preface suggests that the growth is in England (146 congregations compared to last year's 145). When I counted the recognised congregations and unofficial fellowships I also counted 146, but none of those are new, so perhaps last year's numbers were wrong? I'm confused.
However, going through the directory, I can see that one congregation has closed in England and one fellowship has been formed in Scotland. Gloucester Unitarians, listed as worshipping with the Quakers once a month in 2011, has disappeared in 2012. Gloucester is a city with a population of 121,000.
Forth Valley Unitarian Fellowship is new. They are meeting in members homes, but do have a decent website.
So, overall numbers of congregation are steady or steadily declining. I do wonder though, how long numbers of members can continue to decline before we see numbers of congregations declining rapidly. I wouldn't be surprised if one year we see ten congregations dying. But some research does suggest that small congregations can be surprisingly resilient.