Missing extension kit backplate

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My extension kit was installed a few years ago onto the existing backplate that was there for the old hot water programmer. That back plate doesn't cover all the pins on the back of the extension kit.

I'd like to swap to use the digital interface to the boiler but to do that I'll need a wider backplate that allows wiring to those digital pins.

I no longer have my original box or backplate - does anyone know if it's possible to buy just the backplate from tado or anywhere else?

Or does anyone have a back plate they're not using and wouldn't mind selling to me (in the UK)?