I have found an Army letter that states:
. The allowance for all 3 Services for intra theatre-moves will be amended to give between 1 and 10 days for relocation, as decided by Commanding Officers of receiving units.
and refers to JSP 760.
and JSP 760 states:
c. For RAF personnel. Service personnel assigned within GB and NI will be entitled to Relocation Leave[1]. The length of the Relocation Leave will be as follows:
(1) For an assignment which results in a change of station and domestic accommodation location – 5 working days.
(2) Where an individual moves to another station but does not relocate domestically, or moves between units on the same station – 1 working day.
[1] This entitlement is extended to graduates from Phase II training, where the course length is greater than 6 months and a domestic relocation has taken place due to service reasons.