Well, we took the Royal back to the shop with the other Royal we have her in with and I'd managed to remove 9 ticks altogther (intact with their heads!). The shop guy looked them over and couldn't find any more so said we didn't need to treat with frontline or anything.
Fingers crossed, everything seems ok.
We've got a new viv for her to house her seperatly, so hopefully, we'll get over the non-feeding hurdle soon