You're welcome Phil - the over-axle pipe is on offer on ebay :
https://www.ebay.co.uk/itm/Replaceme...w/141000975527
Please don't buy all 10 though!
https://www.ebay.co.uk/itm/1x-KLARIU...-/141678195344
That's the middle silencer too.
That clamp-in section with the Lambda boss are designed as repair pieces and may not be long enough to act as a decat pipe on their own. Also looking at the diagram, it suggests the O/D of the cat section is 54mm or 2 1/8" so the one i linked to won't be the right size from the look of things.