Following Paul's suggestion I have ordered a 50 ohm PL259 plug and adapter to BNC. The soldering on the PL259 looks easier than the BNC plug. Parts are due Wednesday (I hope).
I think the 8m dipole and coax want replacing. I quite fancy trying a vertical halfwave.
UPDATE 0810z: I have found an angled BNC plug. If my plug does not arrive by Wednesday, I shall try to fit this. I think it is a 50 ohm one.