...there were quite a few substitutions, so the totals now look like this:
My stuff: £3.55
Steve's stuff: £23.44
Joint stuff: £13.69
So Steve's stuff is £9.75 more expensive than the joint stuff and £19.89 (over 6 times) more expensive than mine. His 3 lots of ice cream and scotch eggs have been substituted along with one of the juices, so I bet that's a big bottle that Steve'll have all to himself again, so it's a good job that there's still a pack of 4 (2 each) left in the fridge from last week.