The Firefly, another one of the DeAgostini pod vehicles which comes with the 1/144 Thunderbird 2 build.
I have put a little light weathering on the model as it did look a bit too clean for the photos.
In the TV series it is used for fire fighting and debris clearing.
The protective shield at the front is made from Cahelium Extract X ( according to the 1967 Thunderbirds Annual), and has a view screen and a hole to allow an extendable heavy duty gun to fire nitro-glycerine shells used to snuff out fires.
The rear of the Firefly carries a gantry which raises and directs a high pressure jet of water. There is also a foam dispenser.
The Firefly appears in the episodes, City of Fire, where it’s housed in Pod 3 along with the Mole. It briefly appears in Terror in New York City, this time using Pod 6. It also has a cameo appearance in Cry Wolf in the vehicle hangar on Tracy Island.