I haven't looked at the figures (though husband has been doing a spreadsheet since December to see whether the new Tesco Clubcard thing is worth it, so they do exist...) but I imagine there'll be a slight increase.
Almost all our normal meals were home-produced anyway - breakfasts here, packed lunch rather than bought, no coffees out, takeaway once every two or three months, pub meal ditto - so that's made very little difference.
We now have four people as opposed to the three that was the norm for 70 of the previous 76 weeks, so that's probably the biggest change.
We're buying rather than making bread for sons' lunches, (haven't had flour in Tesco's for some weeks now) and have gone back to buying them yoghurts.
There was no cheap orange juice for a while so had to buy the next level up for a couple of weeks. I had to buy different crisps the last couple of times, but I decided to try the slightly cheaper ones instead of going for McCoy's. Standard raisins were all gone so bought value sultanas instead. Own-brand vanilla extract was gone so I got vanilla syrup for my coffee instead of the expensive stuff. Managed to eke out our tinned tomatoes until they came back in, and our 3kg bag of pasta wasn't finished before the replacement stock arrived.
We normally buy a couple of multi-buy offers. Have switched to the now slightly cheaper oranges, and have noted that they're now selling double-size bags of grated mozzarella for the price we were paying for two.
Alcohol consumption is unchanged (I'll admit that left to myself I'd probably have upped it a bit). We make wine and beer from kit and have whisky and liqueurs from Christmas so don't normally buy much anyway.
Various salad vegetables are on offer (eg tomatoes were 39p rather than 79p this week). We've mostly been ok with stocks for veg, though broccoli was all out the day I wanted it and the sprouts were ridiculously yellow. Bananas have been variable, but they usually are. I think the grapes / melon / berries aisle has been less stocked but I don't usually buy them anyway.