Does anyone have a recommendation for a cheap cycle rack that would fit the roof of a ‘16 Mondeo estate? I won’t use them very often but would like some available for when needed. I’d consider secondhand.

I've been using Thule roof bars and cycle carriers since the late 90's, not cheap but I'm sure you can find second hand items on ebay or gumtree. Have a look at the Thule website where there's a fitment selector tool thingy

Are they a global fit item? ie will roof bars that fit an Audi with the same style of rails fir a Mondeo?

No Thule bars are car specific in terms of feet and bar width, so to get a set that fits your car you need the right feet and width of bar, they do version for cars with or without roof rails have a look at their website.

https://www.thule.com/en-gb/gb

Much obliged.