I think even this is a flawed estimate. I don't think you'd save anywhere near £130 off of your ENTIRE electricity bill with these. I was thinking you'd probably save about 20% off you LIGHTING bill over conventional energy saving bulbs.
Which means if your entire yearly bill is £1200, and 12.5% of this is lighting this works out as £150 a year for lighting. Then if you're saving about 20% of your lighting bill with these LED bulbs that means you save around £30 a year. "Great!" you think. Then you remember you spent £800 fitting out your house with these and it's going to take the next 26.6 years to break even.
Wat. Say your normal bulbs are 100w these are 4.5w.