Shorts Belfast refuelling probe?

[Double Hydco]

I've seen several photo's recently showing G-BEPS both in storage at Manston, and newly arrived at Southend in 1979, with no sign of a refuelling probe.

However, a couple of subsequent photographs of the same aircraft, taken circa 1980/81, in TAC Heavylift and Heavylift livery show the probe refitted?

I know the probes were removed by Marshall's during the Falklands war for the RAF, but I'm curious why PS would have had the probe refitted once in commercial service?

Perhaps there is an engineer involved with the aircraft in its early commercial days, or during the certification that knows the answer?

Thanks, DH