Originally Posted by
frodo_monkey
Probably carrying one for air carriage hour reasons.
One on either side on the picture shown, same for the PWIVs, also probably for vib/carriage reasons. In this configuration (tanks, pod and air-to-air missiles) the Typhoon can carry 6x Brimstone and 4x PWIV, but outside of a deliberate op the configuration above is more than enough.