Seems so Stu, but there again I did find reception bad when abroad. Got a better signal in Spain than I did in France, Germany or Czech Rep.

Orange and T-Mobile signals are often believed to work less well in buildings, because of the higher frequency of their signals. Vodafone and O2 networks are GSM (GSM 900), whilst the Orange and T-Mobile networks are GSM 1800, so perhaps the mountains in Wales play havoc with the signal strength in our area...