Writing a list of what to take... Put a tick next to it when you've packed the item. Take the list with you and cross the item off when you've packed it to come home.... You won't miss anything then!
I managed to get a £25 gammon joint for £2 on 27th December, it was so big I cut it into 3 joints and froze 2 of them. It served 5 of us for 3 roast dinners with lids of leftovers too!