Tried fitting some coilovers a lol while ago and had a struggle finding the top mount for the rear suspension.. Any help?

I think they're just above the bump stops, one left, one right top of the shock absorber.

In easy terms how do you get to them to undo them?

jack up, axle stands, remove wheel, socket and ratchet with an extension bar I suspect.

You sometimes have to pull back the arch liner to reveal the bolts, normally you Should be able to see at least one, tbh should you be fitting coilovers if you can't find the rear shock bolts?

Can't be we have had a look under there :/ it's a real pain :/

Its there. 2 bolts. One either side of the shock absorber.