Because Tesco will be closed for 12 hours and the world might end if I run out of limes.
On my list:
Limes (in case I run out)
Bin bags (for a tip run as the bin is almost full and not going to last another 10 days)
Silver cleaner (annual cutlery polish)
Alka Seltzer (or something for bad guts)
More cream/meat/cheese/turkey/party nibbles (for the panic)
What have I forgotten?