Well I sent an email to modellettering (Barry) and the reply from Sarah was basically 'no' then went on to say they can't print white on white! Which is not something I requested
A shame really because according to his web pricing, even before the two special prints I needed the rest of my lettering came to about £30, so that's a sale he's lost.
However all is not lost. A very kind forum member has done them for me, no queue or waiting time, I emailed him a jpeg of what I needed and he mailed me back a couple of hours later to ask for my address as he had done them! Fantastic service and only for a donation to the RNLI next time I pass a collection box.
I'm just sorry I can't name him. I forgot to ask for permission to do so and its not fair on him to do so without it.