I returned from Greece Tuesday to find I either have 1 bar of signal or no service, especially at home. Research doesn't show any known issue but the fact I can't use my mobile to make a call or send a standard text indicates there's a problem somewhere.
I've checked the postcode and it's showing the closest mast to you is just West of Hitches Lane. It shows the mast as being fully operational. I'm afraid there is no tool to test internal signal as it can be affected by many factors outside of our control.