The best “out of the box” idea I can think of, is to push UK more into Islamic sphere of influence with deliberate actions and encouragement from us, both covert and overt.
Islamic influence as we know by experience, is like “terraforming”. It is designed to destroy the legacy heritage and supplant a new culture literally on the ruins of the old heritage.
We can definitely make this a target for our 100 years of independence celebrations. it’s the best “FU to UK” we can gift ourselves, for the centenary celebrations.
And it’s very simple really, keep giving more funds to UK Muslim groups thru Indian Muslims on the condition that they should create more Birminghams across the UK. You throw in 50 new magnificent Barelvi mosques and 50 new magnificent deobandi mosques sponsored by us in to the mix at various other parts of UK, ooh la la..
Edit: infact the more I think about it, the more I am loving this idea. British labour and Islamists will only welcome this, no resistance will be met.