Bealzebub,
as an ATCO, I couldn't agree with you more. many of our frequencies are getting overloaded and the problem is getting worse not better with barely enough time for a basic service provision and no capacity for when things go wrong.
NATS is short of controllers, particularly on the busy sectors. Market forces over the last decade have forced NATS to cut costs and privitisation has led to a serious funding problem.
That said, privitisation makes NATS more customer focused and comments like yours, from pilots or from airlines should force NATS to address your concerns. Have you tried getting these issues raised with NATS, through your chief pilot or ATC liason ?
"Still more reason for us all to strictly adhere to RT discipline."
- well said Capt H.