Off Topic DIY

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Masking tape on the tile. Mark the point to be drilled on the masking tape. Helps stop the drill bit slipping too.
 
Latest update, got all the bits and pieces out and ready to go and now see the wall plugs and screws are loads bigger than the 6mm arrow head bit I was sold yesterday (even though I took them with me and showed them)

Been to another shop and their recommendation (which i bought) is an 8mm diamond tipped thing that looks more like a grind stone than a traditional drill bit. Additional advice is to use dry.
This bit doesn't have a point so center punching or masking tape isn't going to help stop the wandering.
 
Me, I'd use a 8mm bit to drill the tile then a 6mm masonry bit to drill the wall behind it.

If the tile is ceramic use a masonry bit, porcelain use a tile bit.

Edit, Asterix's advice above is good. If you **** it up it'll cost you even more.
 
Did you put the tiles up yourself?
If they have just been dabbed rather than spread you could be in for a cracking time.
I’m stripping paint at the moment rather than watching paint dry at KCOM