Hughy - i'm still working for Stu part time these days pal

Personally, if you can, i'd try and borrow an ECU & Chip complete out of a friends car and substitute it for yours.

If that works, then whip the lids off and try swapping your chip into their ECU and test again.

Chattering of injector 2 is quite common on corrupt chips, obviously it's not the only cause, but may help you trace the fault to ECU, chip, daughterboard, loom etc. and make the repair cheaper and easier!