The consultation on reform of APD ended on the 17th of June, there are various options up for consideration all which are broadly considered to be revenue and Co2 neutral !!
In amongst the detail is to consider the regions out of London (LHR LGW LTN STN) at a lower rate than those within, this they think would push passengers to use regional airports that are not as busy as London airports, it also gives consideration to devolving powers to NI,Scotland & the Welsh assembly
The real problem here is that any APD should be standard across Europe for starters.
If CWL had the power to set zero, what would BRS do? if BRS moved to zero, what about BHX? & EMA? NI is much easier and to a lesser extent so Scotland, but we run the real risk of England paying APD (along with uni fee's, prescription charges and care home fee's) but the rest of the Country doing its own thing!! hardly fair or equitable??