Okay, so I went to the shops this morning, mission: find a foundation.
I had makeup from MAC, Napoleon and Dior applied to my face and all of them seemed to still be too heavy, even though all of the foundations were supposed to be lighter coverage ones. I just felt like I had that painted look. Clearly I'm not used to wearing proper foundation, but I thought at least one of them would kind of melt into my face a bit, not look like a layer sitting on top of my skin!
I got given a couple of take home pots from MAC & Dior so I can try them at home myself, but I'm pretty sure the Dior isn't the right colour for my skin (Dior was the last one I had applied, and in the harsh light of day my face looks too orange).
If I can't find a foundation I like, I'll probably give nude by nature another go. I used it a couple of years ago and I liked it.
I will probably go to Priceline as a next port of call and have a look at the Bourjois and Rimmel foundations suggested in this thread.