Happy days! I tested the economy on the run to Dudley's auction. 24.9mpg, however with the smaller wheels I've actually travelled less than the 216 miles I recorded. Even allowing 10% though it is still better than I've recorded so far.
When I got home, I ripped off the manifolds and found this:

The exhaust manifold has been leaking like a sieve. I put on a new Permaseal EM01 gasket with plenty of JB Weld Ultimate Copper RTV sealant. This time I detached the X2 manifolds from the engine pipes, re-worked the stud washers to get them more square (nod to Drew), and replaced the flange gaskets.
Changed to the tall steel rims, ready for another run, this time down to the shack at Pondalowie Bay.

Went for a test run and all good. No more tick tick....
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