Another day, another question!

Does anyone have any experience of regs regarding venting a cooker hob into this passageway?

it's open ended both sides, and has a curved roof. The location of our cooker hob extractor is meaning the vent would go directly out our brick wall and into the passageway at the very top.

I've spoke to next door and they're fine with it, but wondered if I would fall foul of any regs regarding venting of fumes into a shared passageway.

I dont expect it to be caked in grease etc, but certainly plan to wash it down every few weeks, as it gets covered in webs and such now.