I add 80mm. Doh!!!
Not saying this is the best method of hanging radiators but it's quick and works for me:
1. Small pencil mark for centre of radiator about 15" up from floor.
2. Measure for right bracket distance (check back of radiator!) from this first pencil mark.
3. Small pencil mark 10½" up from floor to bottom of bracket (obviously check skirting boards and other obstructions to ensure this will look okay!)
4. Small spirit level set vertically against bracket and hold bracket tight to wall.
5. Mark two drill holes.
6. Start with 6mm drill hole and if bit slips around use small bit for other holes. Then use larger bit(s) as necessary.
7. Screw in bracket.
8. Measure distance between fixing centres on back of radiator.
9. With this distance for left bracket make a small pencil mark.
10. Hold bracket against wall with small spirit level.
11. Balance long spirit level over both brackets.
12. When happy with vertical and horizontal levels, mark screw holes.
13. Screw in bracket and about 19 times out of 20 radiator will be bang on level and centred correctly.
Usually takes me an hour or so for first radiator then 1/2 hour per radiator after that.
