On Dec 5, 6:54 pm, "
wrote:
that's an 84p call (3.5p per minute that should have cost 5p via 020
7227 7886 - which she now has written on her oyster card) plus another

Actually that could be wrong - according to wikipedia an evening call
from BT to 0845 costs 0.5p/min so only 12p.

It's remarkably difficult to find how much these calls actually cost
the person calling them but easy to find how much (or little)
businesses will pay or get paid to have these numbers for people to
call.

Tim.