Ouch ...
Scary stuff for we USA based Brits.
Over here you really don't want to fool around like this. Besides even if you have and IR going unexprected IMC in a steep spiral isn't smart.
A bigger problem (which I guess you don't have over there) is that we like to be cautious about cloud clearances for traffic. Especially close to terminal class B airspace. Seeing a heavy jet pop out into the hole doing an RA is sure going to get you a phone call or worse!