...............your question is? (I, for one, am not a mind reader)
Above are my opinions Below is my signature.
Would you hit a nail with a shoe because you don't have a hammer? of course not, then why work on anything electrical without a means of testing Click Here to buy a "tester" just because it works, does NOT mean it is safe.
Where can I buy yellow building sand. No where seems to sell it: Wickes, Screwfix, Toolstation, B&Q, Jewsons. Cheapest is £14 online. It costs £4 maximum.