The message
from "linkuk" contains these words:

Any advice for what sort of drills to use for drilling old very tough
concrete. No holes will be less that 6 mm diameter.

B&Q and all the other places do cheap SDS drills. They're magic and will
sail through even well hardened old concrete.

The walls here are concrete and I bust loads of drills and took nearly a
day to drill five holes once (luckily the neighbour that side was
utterly deaf).

SDS drill just slides in - about twenty seconds for a 3" deep 10mm hole.

Cost about £30.

The all look like this...
http://www.screwfix.com/app/sfd/cat/...18678&id=58494

--
Skipweasel
Pay no attention to that man behind the curtain.