Raptor,
I agree that the service at LHR is going from Bad to worse but to be absolutely honest, there is no point complaining to the airline you travelled with, if the service was as excellent as you say then it is merely the LHR side that is unique! You should really be writing to BAA, Globeground and maybe your local MP or something! The airline will simply send an apology with the usual crap on it about following it up but will never happen! Trust me, i worked in customer relations for a major user LHR user and lhr complaints were 10 to the penny with nothing we could do about it!
Of course, if your simply trying to sponge a few vouchers off the airline in this day and age of mass bancrupcy...go for it!!!
p.s....excuse my spelling, just in from a longhaul and couldnt be bothered with a spell check!