Nothing new to be honest, over the years various bus types or vehicles based on bus chassis have been used as Mobile Command Centres for various fire brigades. Here are some examples...

Tyne and Wear Fire Brigade - Dennis Dart SLF / ELC (Since replaced by a truck based vehicle) - https://www.flickr.com/photos/magility9/23367349691
Tyne and Wear Fire Brigade - Dennis Dominator / Angleco (Replaced by the Dart SLF, though has been preserved) - https://www.flickr.com/photos/76935272@N05/9805545044
Strathclyde Fire Brigade - Scania K93CRB / Leicester Carriage Builders - https://www.flickr.com/photos/gerrymcl/13467516223
Durham Fire Brigade - Mercedes Benz O814D / Plaxton Cheetah - https://www.flickr.com/photos/magility9/4987910474
Greater Manchester FB - Volvo B6 / N-C Paladin - https://www.flickr.com/photos/golfsierra999/9529375172
London Fire Brigade - Volvo B10M / Spectra (Passed on to other brigades and now with a private firm) - https://www.flickr.com/photos/26024754@N07/5275973802
Northamptonshire FB - Dennis Dart SLF / UVG Urbanstar - https://www.flickr.com/photos/58777216@N06/15158920866/
Buckinghamshire FB - Mercedes Benz OH1416 - Wright Urbanranger - https://www.flickr.com/photos/quicksilve...4942143097
Mid West Wales FB - Transbus Dart SLF / ELC - https://www.flickr.com/photos/16856772@N08/7924357070
Royal Berkshire FB - MAN 11:180 / Leicester Carriage Builders (raiding the ELC parts bin) - https://www.flickr.com/photos/30131135@N04/2846228581
West Sussex FB - Dennis Dart / Leicester Carriage Builders - https://www.flickr.com/photos/british_fi...6068909009
Hampshire FB - Mercedes Benz O814D / Plaxton - https://www.flickr.com/photos/matthewleggott/6059350231
London FB - Ford R1014 / Willowbrook (some of these will have made appearences on Londons Burning) - https://www.flickr.com/photos/bunny400/45066971474/
Gloucestershire FB - Dennis Dart SLF / ELC - https://www.flickr.com/photos/ga132/22202670552

There was one case where one fire brigade attempted to convert a former Dennis Dart / Wright Handybus into a utility fire engine, but the idea was quickly scrapped - https://www.flickr.com/photos/davidsbusp...426530641/ and https://www.flickr.com/photos/mank999/3052551948