A quick update, 2 months on...
I've fitted a Toyosports stainless cat back system, but the pipework is a slightly larger diameter than the pipe leaving the cat, so I will look for a "lap joint" or torctite fitting to get it gas tight and stop it rotating as is the case with the simple U clamps. So whilst it was cheap at £130 it will need a bit more spent on decent clamps.
I've fitted a replacement temp sensor fan, and fixed the heater flap, or rather it seems to have fixed itself, perhaps simply removing the actuator and allowing the flap to drop shut again has fixed it?
I found the centre switch panel console almost impossible to replace with the radio frame and radio attached, I don't remember having that much trouble with it on the Porto, but I was swearing like a trooper...But I did at least fit the same Kenwood KIV-700 head unit that I also have in the Porto, to replace that awful Clarion OE units. I had bought a replacement KIV-700 from eBay after I thought the one in the Porto was faulty, but it turned out to be a bad earth.
So I had some good music and the heater flap stayed shut all over the FCSS weekend, where I felt obliged to turn up in the Plus to keep the "Dutchies" happy after their disappointment in me bringing the Porto along to Assen.
After the weekend I fixed the sloppy gear change. I removed the insulation around the base of the gear stick, expecting to find a broken housing, but found instead that the 3 bolts holding it in place were all loose, perhaps the housing had been replaced previously and the bolts not tightened enough? Unfortunately, to access the nuts on the other side means removing the cat and dropping the frame holding the handbrake and gear lever (and heat shields) down below the car. I left the downpipe in place but removed the centre part of the exhaust, so when the frame was dropped it was resting on the end of the downpipe, but there was enough room to get to the nuts and tighten the bolts. The gear change is much better now of course, but I still might put on the exchange short shift I bought.
I also fitted the new OE drilled front brake discs and found some more minor horrors: one of the brake pipes to the caliper looks to have been replaced, all 4 disk hold-down bolts were already snapped off, and one of the calipers now has a stripped thread
But the brake squealing seems to have stopped, yay!
Unfortunately I forgot to collect the tank straps from Joe over the weekend
so that job will have to wait.