I had mine done recently by the Mark Group. it is a detached 2 story building, I paid for it, though they are doing loads for E.On for free for thouse over 60.
I think the cost was £140. The guys came on time, were very professional. Did the job quickly and efficiently, even filled the holes with white cement to match the walls.
Overall I had a good experience, and I suppose if E.On are using them, they can't be a bad bunch, though as with anything you can get good and bad in any outfit.
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