Well, City & Guilds courses aren't listed anywhere on the UCAS Tariff, so I'm assuming they don't have a points value. That said, lots of institutions say they'll count a level 3 C&G qualification as equivalent to 2 A levels.
Nope. Unless you're applying for a course that is directly associated with the City & Guilds you have.
I did Television and Video production, as well as Radio & Journalism, with 2 other A Levels, which was easily the equivalent of 6 A Levels and they count for jack unless you apply for media courses at uni (Let’s be honest, anybody can get onto a media course. I know degree graduates who’ve got less production skills than me).