On Wed, 31 Jan 2018 18:29:45 +0000, newshound
wrote:

As others suggested, very straightforward once I gathered up the courage
to break into the loom.

Often the biggest hurdle with many jobs, making that first step. ;-)

It basically interrupted two of the live
supplies associated with the ignition switch and didn't in fact do
anything unpleasant behind the fusebox, as I first feared.

Excellent.

Still took half a day to expose all the wiring, and half a day to
reassembly the radiator and the rest of the stuff that had to come out.

That was basically the extent of it's 'defence' then (or less as you
were doing a good job).

Fortunately not an engine with an ECU.

Excellent.

Was the electric fuel pump an addition or was it standard OOI?

Cheers, T i m