RogerT wrote:
Having had several bonfires (in an incinerator) over the last week, I
have accumulated a large pile of wood ash, combined with bits of charred
wood. I recall a discussion a while back about the use of ash, but
regretably did not keep it.

What is is best use for the ash mixture?

Generally dug in to the veg plot

Onions seem to like the extra drainage from any charcoal.

Spread around soft fruit or shrubs

That and under fruit trees is the best use of it.

Used for specific plants

Thrown away

No - wood ash is valuable as fertiliser provided that you were not
burning CCA preservative treated timber.

But don't use coal ash on the garden - too much heavy metals and there
can be enough boron to be toxic to plants.

Regards,
Martin Brown