Wow. That's oddly hard to find.

I only found one — Kensington PilotBoard — and then realized you probably wanted a UK layout, and they don't seem to sell a UK version of that.

Check to see if HP sells one. They sell a US keyboard that matches your specs, but their site seems hosed right now and I can't get it to load to search for either one.
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Bitt Faulk