Yes a special offer in a pack of vouchers that Powergen sent out in the mail.
Other offers in the pack include 4 free low-power light bulbs and £200 off a replacement A-rated boiler (though they have to appoint the installer so may not be so cheap in the end).
Rob
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Thanks to all for the replies. Mine is a 3 storey Victorian mid-terraced.
I shall let you know what happens when I call them and they send their 'inspector' round.
Rob
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