DavedF
You have convinced me : )
My order came in a 310 quid when Magneglaze were 560 quid - that was too much of a difference.
Many thanks for the tip & I bet your are feeling the benefit in this cold spell.
I couldn't find any reference or review to Magneglaze customers, so I bit the bullet and had my four living room sash windows done at a cost of around £320.
Installing them was a doddle although you do need two people. Just take off the perspex film and magnet tape backer and stick it onto...