Wethersfield will suit the Clio very well. It's relatively smooth. The surface varies from clean tarmac to some broken concrete with mud/gravel on top. Many people take out standard road cars. There's the odd tight bit and some buildings/posts to hit, but they'll be cautioned.
There's one test which goes round buildings where there are chicanes - the quickest line is cutting on the grass but it can be a little bumpy and slippery at first, especially if it gets damp. no problem in the Rover with it's huge, heavy sump guard! There's also the odd kerb there.
I don't know whether you've done a Targa before, your navigator will have to work! Cones sometimes aren't where you expect them to be from the test diagram, I've spent too much time sitting on the airfield trying to see where the next cone is. It's far better to double enter - drive and then navigate, or ideally the other way round. Navigating first is a HUGE advantage when it comes to your turn to drive.
Then sort out how the navigator calls the cones. We keep it simple - which side of cone then angle of depart. Keep it simple. You may need to add more, such as a 360, but keep the verbage to a minimum. But you probably know all that already.
You'll enjoy it, the tests normally flow very well there and are a logical set up. Come over and have a chat - purple Rover 214. My navigator is currently on the reserve list (he forgot to pay his entry!), hopefully he'll get a run. If I'm not in my Rover I'll be in his blue MG ZR.