I am fitting floor mounted pedals to my Avon. Couple of questions... Do I need still need to fit the sierra brake regulator as well as the bias bar? Also where is the brake light switch on the loom. I have a T peice with hydraulic switch and am wondering were I should fit this? Any thoughts?

No you don'i need the valve

Don't know (I didn't use Tiger loom)

Different opinions on where to fit the valve. Mines on the front as easier to wire up. SVA man didn't check one way or the other.

Ditto,
Don't fit the valve (will somewhat negate the ability to adjust the front to rear bias otherwise.)
Have a look on pic I posted in reply to your previous post on /brake/fuel lines and you'll see that I located the T-piece near the reservoir and master cylinders.
This is so that the brake light wiring on the tiger loom should reach it.

Andy.