I took the window sill off the bay to make it airtight and don't know what to make of the state of the outer brickwork inside the cavity. Does this need attention or is it okay to ignore and carry on?

 

Here's the outside. The horizontal cracking is at the wall tie level (tried painting them to waterproof the cracks with paint that didn't match).

 

And now for inside

Edited August 26, 20233 yr by Sparrowhawk

I have a neater pile of bricks. 

Done to British Standard. Sorted.

At least you have a cavity.

How old is the house?

12 hours ago, SteamyTea said:

How old is the house?

97 years old (I think). Almost 100 anyhow

So the consensus is messy, but make airtight and carry on, no need to get a builder in?