I bought a box of wild flower mixture with sand and vermiculite, and after putting some in the 'spare' areas, I've filled several pots which I hope to transfer at some stage!
Anyway, if they flower this year (which may not happen), I'll see what there is and hopefully will be able to pop them in to more permanent places once established!
Well, that's the grand plan...
ps - Off topic, they haven't mowed our local churchyard for weeks, and we've never seen so many butterups, clovers and oxeye daisies in full bloom! It's fabulous!