Many thanks for the tips, much appreciated .... hope to get stuck in soon
RE the breather system, I recently sorted mine out (Also B230FK so will be identical) and the job is fresh in my mind so I'll offer a few tips...
1. Don't bother replacing the separator/breather box! The aftermarket ones are apparently flimsy and the original is easy to clean. I blocked up two of the holes on mine, filled the third exposed inlet with brake fluid, sloshed it about, let it soak and repeated the process once more. Now breathes clean and clear and only cost a couple of pounds worth of brake cleaner.
2. When you've got the box off the black, detach the lines that come from it and make sure they're clear. I replaced the smaller vacuum line that goes from the upper breather tube to the manifold with 4.5mm id silicone hose, again only a couple of quid. Also check the breather/vacuum/nipples on the manifold these get blocked too, a 2mm drill bit works perfectly to push through them.
3. Don't waste any time looking for the 'flametrap'! Lots of reference to these online and I searched for mine for ages in vain, in reality later turbo cars weren't fitted with them. Save yourself the time, there isn't one