In message ,
Martin Pentreath writes
On Wednesday, August 29, 2012 12:55:54 PM UTC+1, Ian Jackson wrote:

How old is the house? If it's been there a long time, and there's no

sign that anything will collapse, I would be tempted to repair things

with something flexible, so at least the cracks won't reappear (or at

least so they will only appear at the junction of the flexible and

non-flexible parts - so you will know where they are).

--

Ian

Hi Ian,

The house was built around 1880. But anyway, there aren't any
structural problems with the rest of it - it's just the bay window that
has no foundations. So really I'd already decided that it's just a
filler job. I'm wondering what the best filler is to use for this, and
particularly for the sill, which I think will be left with a gaping
hole after I've removed the bit that's cracked away.

Having done, in the past, a fair number of body repairs on my
ever-rusting bangers, I'd be tempted to use up some of my car repair
materials (fibreglass matting, resin and paste). I suppose 'Plastic
Padding' is maybe the most appropriate (especially the flexible type).
However, there are probably better 'genuine' building materials for the
job - which others will advise on.
--
Ian