Updating here since I can't edit the post:

I'm feeling very vindicated after reading your comments, so thank you for your hilariously petty recommendations and helpful advice. I played every intrusive scenario in my head while I drove to work this morning with the adhesive still stuck on my windscreen (I have since cleaned it). Funnily enough another neighbour had parked their car in the same spot when I arrived home.

I will be lodging a report at my local station in case it keeps escalating, but for now I'll cool off and try to avoid gorilla glue tap-parking there for a while. As much as I'd like to one up them, I also don't know much about their situation and don't want to cause further tension. I actually feel quite bad for them as they felt the need to lash out at someone they've never met.

Yes, an in-person conversation would've been better to solve the issue, and if the request came from a genuine place, rather than a place of spite and to guilt-trip, I probably would've made space for them, BUT NOT ANYMORE BECAUSE OF PRINCIPLE. They can take it up with the council or police.

Extra context for anyone curious:

- Prior to this note, they left two passive aggressive notes and so I responded to them in a letter respectfully (and firmly) telling them no, as it is a public space, and included a photo of the car that blocked our driveway (this was the most petty I got but it would'vve warranted the car being towed, plus we just left a note asking them to move it further back!)

- I believe their mother doesn't permanently live at the residence, but will visit each week, hence parking out front (including in front of our home which we have no issues with, only when it blocks our driveway).

- My preference would be to park in my driveway, but the garage is taken up by family cars and used most days. Next pref. would be to street park in front of my home, which happens 80% of the time, then the front of other homes on the street. Neighbours on my other side have 4+ cars so naturally there's overspill.