Potential for church planting in the UK
The largest towns without a Unitarian presence:
Walsall (the church closed last year)
Cleethorpes and Grimsby
These are all Metropolitan Borough Councils or equivalent with a population of over 150,000 people. If you assume that a population of 150,ooo people could support one Unitarian church, then each of these could support one church, Fife could support two. Manchester does support that many Unitarian churches in relation to its population.
There are subtleties, for example Stoke itself does not have a church itself, but Newcastle-under-Lyme, which is technically a different town but effectively the same urban area does have one.
Large cities that could support more Unitarian churches (1 for every 150,000 people, the density in Manchester) are:
London could support 36 more churches.
Birmingham 4 more
Leeds 3 more
And all these towns could support one more Unitarian church:
To be blunt, I'm not aware of any Unitarian churches that were founded in the last 100 years, nevermind the last 10.
I think fellowships have come and gone. For example I think a fellowship started in Solihull, the town between Birmingham and Coventry, in the 70s and died in the 80s. I think these tend to be small social groups that don't outreach much and so die when people die or move away.
The task therefore, is to explore which of these towns has circumstances congenial to a church plant (like a sympathetic district) and find what sources of funding exist to pluge a few grand in to start a church.
Corrections are welcome.