Found some bits in a garage clearout that are now surplus to requirements.
1x 3.6 Manual ECU, part number DBC4194. Came from a running car, but has been sat on a shelf for half a decade! Currently up on eBay for £100, but happy to do a deal for the '40 forum
1x set of AJ6 Engineering silencer substitute pipes and rear silencers. Make a lovely noise but not too loud. They're for a 4.0/3.2 car, but you can make them fit a 3.6 by using the later exhaust centre section (pretty confident at least!). They did take a bit of fettling to get them to clear all the suspension bits, but got there in the end. Up for £215 on eBay, but the same applies for forumites. Think the silencer substitute pipes are £257 new.
Can definitely post the ECU. Can probably post the exhausts as well, but would need to get a quote from a courier.