I got in touch with the only local rigger I could find, and they quoted
me £110 including installation plus £45 labour. I guess the latter means
per hour for anything beyond putting it on the roof (i.e. cabling).
Turns out it is a 40cm circular thing. Sounds to me horribly expensive
for something so mundane.

Precisely what aerial should I be getting? And can anyone recommend a
rigger in Oxfordshire? (I am 15 miles NW.)
--
Nic