[Nuvistor]

Hi Steve,
Yes they very possibly increased the power but the original installation was far a specific area that had bad reception of Holme Moss, hence the lower power.
We stopped using 405 when 625 became available in 1969 and many of our customers with dual standard sets changed to the 625 transmissions so I would not be aware of any increase in power after the early 70's.
I think it would have been a large undertaking to increase the power to 125kw ERP, the aerial and transmission lines would probably require replacing unless the original design had taken that into account, nothing is noted in the engineering documents in the link.

Have you a link to the BBC documents giving the increased power levels, it is all academic now but I find it interesting.

Frank