My advice to the OP would be to check the UK AIP. Many of the Danger Areas he listed have the ability to allow aircraft to cross the area when the dangerous stuff isn't happening ( i.e.there is a break in the firing programme). This is often promulgated as a Danger Area Crossing Service (DACS).
I know for a fact that the D201 area offers this facility and the guys who work Aberporth Radar are more than happy to help when activity permits.
If you would like me to dig up some contact details for them then feel free to PM me.