Theoretically it can be fixed by good comm with ATC but it gets kinda busy round London
Don't think good communications would help. The requirement is still to follow the RA.
Used to get frequent nuisance RAs on crossing mil traffic in SPY/PAM area (over Amsterdam) due to high rates of climb to reach the co-ordinated crossing flight-level.= but despite info given when traffic permitted RAs were always followed. Leads to a few heart-stopping moments