How to fill holes in external stone wall

[somersetpaul1969]

We've just bought a house which needs a bit of work doing.

The previous owners had cavity wall insulation done and moved the boiler to another part of the house.

Unfortunately, they've left holes in the external wall.

It's an old house, not brick.

The cavity holes are about 1in, the boiler hole are bigger, with the largest being about 4in.

Thoughts?

 

[^woody^]

Mortar for small holes, units of whatever the house is built of for larger holes.

It was all depends on what you want it to look like.