It depends what you mean.
If you're asking about the English Electric Thunderbird surface to air missile then the answer is none. They were an army missile.
If you're asking how many aircraft there are in the RAF display team (which is called the Red Arrows - but the USAF team is the Thunderbirds hence my assumption) then they normally fly nine aircraft.
If you're asking about the team that operates from Tracy Island then the answer again is none. Those Thunderbirds are fictional TV characters and vehicles.
There are about 50 RAF airfields in the UK.
4 in total all from the RAF Regiment.
The RAF has about 100 Eurofighter Typhoons at this time
two …. many
42,750 Regulars and 2,500 RAF Volunteers giving it a combined strength of 45,250
The RAF have approximately 30 Hercules. These are now being supplemented by the Airbus A400.
There are many places where one can find information on the RAF police. One can find information about the RAF police at popular on the web sources such as Forces Reunited and the official RAF website.
The RAF has used many dozens of type of aircraft. You are probably tthinking of the famous Spitfires.
See, among MANY other websites, Wikipedia: RAF Wroughton.
roughly 46,800
300
I just heard the figure 50 000, which seems veryhigh, maybe I misheard it.