https://foresso.co.uk/pages/table-top-calculator
I got my kitchen splashback from here very recently.
It's really good stuff but be warned the lead time was about 12 weeks.
If you like their product they have an offcuts section on the website that's probably worth keeping an eye on especially given the size you want.
@goodhead started
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https://foresso.co.uk/pages/table-top-calculator