In message , The Natural Philosopher
writes
On 27/05/17 10:27, Graeme wrote:

Yes, if I couldn't get it out in one piece, I would cover the
outside with parcel tape then 'it it wiv me 'ammer from the inside,
with a large dust sheet or (better) plastic tarpaulin outside, to
catch the bits.

Fablon is your friend

I like that idea. Better yet, both sides of the glass, then whack it.
--
Graeme