Armed robbery seems a bit extreme, but meat makes sense as a target. IIRC it is one of the most-commonly-shoplifted items from grocery stores in the US, because it provides one of the highest value densities in that store. I bet that alcohol is up there too, and with alcohol, you don't have the question of whether-or-not the product has been kept at a safe storage temperature before you got it (something that I'd think that people would be more skeptical of with black market meat, but maybe that's just my lack of familiarity with said market talking).

EDIT: Here's a list for the US; this is from 2022. Apparently the US is also seeing a surge in retail theft (due to inflation, maybe?)

https://www.businessinsider.com/most-stolen-items-list-what-organized-retail-criminals-want-nrf-2023-1?op=1

And, yeah, in the grocery section, meat and alcohol are in the top target list. And candy's on there too, so it sounds like the British list is basically the same stuff that shoplifters would target in any grocery store. What's newsworthy in the UK would be the (unquantified) increase.