I emailed Picturehouse (again, getting over-excited) - this is their reply:

Thank you for your email and your interest in The Picturehouses.

We are always looking for great opportunities to grow the Picturehouse family and this site looks like it would be a great addition to our group. We do not currently have any plans for a venue in this area but I have forwarded your email to the relevant department.

Please let me know if I can be of any further assistance and, again, thank you for your interest in the Picturehouses.

Kindest regards,

Jim
Customer Services
Picturehouse Cinemas Ltd

Maybe if enough people mail them, it'll get them looking at the possibility more seriously?