Thanks guys - loads of good information in there!
That was from last September, so before the stricter testing was put in place - expecting it to fail so it's next on the list.
I'll start off by getting the car on the ramps and looking at the condition of all of the pipes, not just the front-to-rear pipes that were highlighted by a specialist recently. Mine's had a "rear brake pipe replacement" at a specialist a few years back, so I'll dig in to what that actually means as well. Nothing ever been done at the front, so will check the state of the pipes in the wheelarches.