Most of the free insulation schemes were chopped by George Osborne about this time last year, although it would be worth checking whether your Mum's current energy supplier(s) still offer it.
Two things occur to me though, (i) your Mum may be used to the house after 40 years (so is the risk that great?), and (ii) she is clearly resistant so is this a battle worth having?
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1984 GT5E Topaz Green
1982 GT5S Helios Blue - now in Ireland
1983 GT5E Topaz Green - donor
1986 GT 2.0 Tornado Red - long gone
2001 A6 2.4 V6 - exported to Ireland
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