Neighbour issue. What to do next?

[redlorryyellowlorryredlorryyellowlorry]

Hi ladies. We live in a quiet, short road. Around 30 houses, all which open straight onto the pavement. 7 months ago our neighbour was having his house painted. Ooh says I......let's ask them to do ours too. Price was agreed and off they went.
A couple of days later they were good to start. We chose the paint and off they set. Myself and my husband were out at work and returned to a lovely great paint job.
Around 4 weeks following this a neighbour from down the road knocked to say the painters had got paint sprinkles on his car (it was parked outside our house when the painting was done). The painters had clearly not covered the close cars with a cloth. We didn't have direct contact details for the painters but we were sure our NDN would as they had initially engaged them.
We asked NDN to get in touch with them or pass us their contact details.
NDN did none of these things despite us asking several times. Neighbour with the car got his car polished, removing the paint. He said it cost £150 and is looking for reimbursement of this from either the painters or ourselves.
On Sunday 'down the road' neighbour confronted DH, effing and jeffing and threatening him. Like zero to 100. Prior to this DH was going to offer to pay half as we can't get hold of the painters and NDN are definitely not going to help with contact. Anyway, down the road neighbour storms off threatening DH and allsorts. DH didn't react to his aggressive approach (retired police).
Planned to leave it a few days for him to calm down and pop over to resolve.
Just now I went to take the bins out and down the road neighbour is walking to our house with a glare. I ask him is he is OK? 'Not really' he growls. 'Just wait till I see your husband' and off he goes giving me the evils.
Whilst I don't feel threatened by the dick swinging, I am feeling huge resistance to helping him meet the cost of the car polish now. But equally I don't need this drama so close to my home.
Any suggestions for the next step?
Should we be the bigger person and pop the cash through his letter box or let the angry man stew in his juices?
Sorry no diagram

Totally agree what an idiot.losing his rag like that.

So many people don't know how to handle situations properly and calmly. They need to learn.
I
I would call the police. He's threatened your husband and you don't know what he's capable of.

The house painters that she doesn’t have a clue who they were.

Pay him. The work on your home damaged his vehicle. It’s the least you can do. You sound like someone I would not like to live near to.

No it’s the painters issue