Air activity is a Workshops setting, should be Medium for A pilots and Medium or Light for B or C pilots. If your squadron moves, say, from Flanders North (Medium Zone Valuation factor) to Flanders South (Hotspot Zone Valuation Factor) you should keep your 'medium' hours as before you moved and all new hours should be in the Hotspot. In all cases Total Hours = Hotspot hrs + Medium hrs + Quiet Hrs.
RAF_Louvert has been doing this as he moved from a 2-seater squadron 13 RFC in Flanders north to a single seater squadron 24 RFC in Flanders South.

See page one for the Zone Valuation Factors.

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RAF 1966-73 Cpl Engine Fitter (Retd.) Trenchard brat 206th Entry
DBA and systems programmer 1981-2005. Now retired since 2014