Dave which are the relevant ENR's you are referring to on the nats website link you posted?
Depends on what you want and what you want to do with them, I'd suggest looking over them all as some interesting stuff. Have to say I primary use it for military information.
If your looking for something you can drop into Airnav then there is nothing, but there is enough information if you want to build your own map for Airnav RB or for just printing large scale on the wall.
But as an example of a foundation map to add to:
ENR 6.2.0 Shows Freq for either London or Scottish FIS
The original map you posted is one you could use and update from info within the link above. Trouble is no one ENR will give you all the information but using your map as a starting point it maybe eaiser.
What would be good is if that one you posted was updated and then the basic overlay was created for Radarbox. If i had the time I'd give it a go, but as I know there is no chance of me finding the time required :-(
Possible Airnav could look at this as a good aid for UK RB users? Those chaps must have some inside contacts ?