There's 365 people live in that town, if 100% of households there pay £30/month then they'll repay that £150k investment in about 4 years or so - this won't including ongoing maintenance costs, upgrades and may not include actual external bandwidth costs - which can be significant depending on how much they're buying. If they're only buying a 1Gbps (LES) line then that could fit into their budget but would mean each household getting around 10Mbps, not the fastest village in Wales then. If they're buying 10Gbps links this will not fit into their budget, in fact it'll double it, and they'd get 100Gbps each - which today would make them one of the fastest, but far from the fastest, village in Wales.
It's great that they've put their own money into doing this but the economies don't work, not long-term anyway - as they don't for 'Big ISPs' - DSL rollout is limited by physics and economics, which are universal.