Put a couple of missing hose clamps on the charge pipe, this has now increased the max pressure to about 7-8psi at about 5000rpm. It's surprisingly quick at high rpm now, and for a sub 1 litre it has lots of torque, even at 0psi, cruising at 70mph on the hilliest of motorways is alot easier and is out performing alot of bigger cars who struggle.
I've covered about 500miles with the turbo on, and it's running rather well, returning about 35mpg now, turbo only kicks in around 3000rpm so it's basically a 1.0 up till then, the power off boost is about the same as before I put the turbo on despite the exhaust and intake. Having trouble removing this faulty lambda though, ideally want to be in closed loop off boost but looking at the sparkplugs I don't think I am, I've now unlpugged it and it's running a tad better for some reason.
Got myself a little 400cell cat convertor, going to put this in exhaust before the cherrybombs and possibly weld the the stock rear muffler to the rest of the system, even if it dampens performance it should be worth it for a quieter, legal and MOTable(ish) exhaust, have been treading carefully around the police lately.
The recirc BOV, although not actually recirculating, is a lot louder than I expected too and is also totally ruining the sleeperness of the car, may redirect it to blow into the cabin