Cheers, I ordered the Collins book last night so will make an evening "light" reading when it comes (pardon the pun) have wall chaser and back box sinker in hand and have found out building regs as regards drilling holes in joists. The only point I need to clarify on building regs is where the joist is flush with the wall and I need to run a cable to the wall if I am allowed to use a notch ( i have read the allowable amount per joist size) and use a nail plate over the notch for cable protection?