Does anyone know where I can get 3 sided mini trunking that I can use to run along the wall corners? (preferably self adhesive)?

Have looked all over but had no luck.

[scooby do]

Try local electrical factors. Somewhere like city electrical. You can get it in 15 metre rolls 1 continuous length if required. Word of warning self adhesive is ok but I only really trust it to hold in place whilst screwing to the wall.

[Boxcar]

Bit of a late reply but have a look at this site. D-Line are a relatively new manufacturer and do at least 2 sizes of 3 sided trunking which can be used as a cornice.
www.d-line-it.co.uk

Will.

[tom121]

Nice Site there boxcar, too bad their online store isn't up yet.