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Top tip! Thanks. I'll have a browse through Waitrose when I can this weekend.
Thanks to everyone else's suggestions too, the problem with going to Pret is I don't think they'll be firing out beans or ground coffee at all, let alone at a reduced price, I think their deal is that they give out coffees which won't work so well for our scenario as we run overnight with a relatively late start, rather than a late afternoon food and drink only type deal. It is worth investigating though, thanks.
Could possibly try looking through the ground coffee by Union and spotting any which has been roasted/ground within the last 4 weeks. I'd try Bright Note. They usually have it in Waitrose.