As everybody is 'all ears' somebody senior at the ARCC or MCA should have a word with somebody senior in the fire service to let them know that tasking is possible.
As has been stated, there are thousands of towers in the U.K. and if this 'once in a lifetime' event should happen again I am sure the crews would want to have a go, at least. It might not have made a difference in this case but it just might have, even for just one or two lives. The tasking authority should have confidence in their 'asset's' professionalism not to add to the casualty list, despite the danger. Risk assessment is what they do on every tasking.