Thanks lads; kind replies as always
The run on the right of the tank, the ogham symbol (it's a symbol of rebirth) was entirely free-hand. The one on the left, the Ulthwe symbol, was a transfer, but I painted over it by hand. I've done this on a number of projects int he past. The transfer is an excellent guide/
I actually found the canopies and crystals very easy to paint. The secret is this stuff:
Tamiya Mini X-26 Clear Orange 10ml Acrylic Paint - 81526 - £1.58This paint dries into a smooth, clear and durable layer. It comes in a variety of colours, and I'm convinced that GW use this themselves (or something like it) for the canopies of the Fire Prism on the box of the model.
Another plus to using a tint for the canopies is that you dont' have to do much for the pilots inside. I actually did paint them, but they're not really visible.
Thanks!