Just got an email from my electric supplier. They want meter reading. It also says I am £142 in credit.......... So I read the meter and whoops, its 1313 units out. Feck. So I do some sums, its 10.9p a unit which comes to......... wait for it! £143. Jeez. Only been with this supplier since April and I remember they asked me how much I used and I told them straight so why the discrepancy? Do they over or under charge everyone? Very strange. 
Tenerife is way ahead of rural Cambridgeshire...... Strange innit.