I've complained to them twice about it and they palmed me off with something about it being 'just the odd one that slips through their stringent quality control' and sent me some vouchers.
I used the vouchers last week and lo and behold, milk all over the worktop every time I make tea, all over the table when the DCs do their cereal.
I actually fished the old Tesco milk bottle out of the recycling bin and rinsed it out, then decanted the Cravendale into it today as I got so fed up of mopping up split milk.
I know it's not worth crying over spilt milk, but I'm bloody 

You had ONE job Cravendale!
Is it just me?!