Hi annabelq, you can try calling these guys and asking, they may not have it but I'm sure they might have a few ideas as to where you can find it:

Wine of Course (London)
216 Archway Rd
London N6 5AX
T: + 44 (0) 20 8347 9006

Do you know where I can buy Latitude 33 Malbec that will export internationally? I live in London now and miss drinking that wine! Any help would be greatly appreciated, thank you!