Sadly not in the not(very much coverage) spots in the South Downs and other rural areas "served" by more than one distant base station. Before the EE/T-M roaming there was a degree of base station flip flopping here but when the roaming was switched on, the service became unusable. For some obscure reason (that EE [c/w]ouldn't explain) my mobiles tended to roam onto the even weaker T-M base hereabouts.
Ended up changing to Vodafone, but only because it has a local infill base station. With no 3/4G, but at least the 2G phone system works.