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It's not the free tea/coffee that represents the value. It's the ability to get some work done when Mrs GB also occasionally works from home. We don't have the space for us both to work from home with suitable healthy setups, and she is on calls most of the day, loudly.
I'm also on the cheap plan (5 days/month that's ~£99/mo), and work pay for most of it (I pay some of it since it's a taxable benefit).
It's less than some people I know pay for osteopaths given their shit work setup on a kitchen table with a crappy wooden chair with no proper back support.
I'd need to calculate how much I spend on tea/coffee at home, before deciding if £249/mo for a desk is good value...