They sent someone around on Wednesday the 13th between 1800 and 2000.
He never turned up, claiming nowhere to park. I can't prove this to be
incorrect, but it seems incredibly unlilely at that time of night and
he didn't ring me to check where he could park.

Might I suggest asking for compensation under the guaranteed standards.

This is an old version of the document, so the amounts payable may have
changed in the interim, but a missed appointment is a missed appointment
- it's not your fault your supplier uses subcontractors, it's THEIRS !

http://www.coreutilities.co.uk/Guara...s_17-12-03.doc

See pages 8 onwards (it mentions transco, and that the standard for
missed appointment excludes meter work, but i'd try it regardless - it's
probably been added in since). Pages earlier than that refer to
electricity supplies.

You might also want to check out the http://www.energywatch.org.uk
website as they might have more up to date information there.