No I haven't noticed food going up really. Maybe some items slightly but why would we expect everything to stay at the same price? Food has been very cheap in the UK for years.
Me and DH are both vegetarian so eat loads of veg, fruit, lentils, different beans, chickpeas etc. We buy big sacks of onions, lentils, chickpeas, spices in indian supermarkets. It means a bit of a drive but the saving is enormous. A massive bag of onions for £1.99 and 25kg bag of chickpeas is £30 but lasts absolutely ages. It works out at 12p per 100g whereas 100g bag of chickpeas is 78p!
We are lucky that we have room for storage though. We are not that well off so are always aware of prices. We spend about £40 a week for both of us but cook just about everything from scratch. I menu plan and bulk cook. I am also good at spotting bargains.
We shop in Tesco, Asda, Morrisons, Sainsbury, Farm Foods and occasionally Lidl. We like Sainsbury the most. Nice clean airy stores and their veg lasts well. I don't think they are expensive but it depends what you buy.
I always input my shop into "mysupermarket" and most times Sainsbury is the cheapest with Asda usually being the dearest.
We do a large shop about every 6 weeks and then shop weekly for fruit and veg. We usually try and buy the bulk of it in markets. Yesterday we bought a large cauliflower for 80p. It will go in 3 meals - cauliflower and potato curry, cauliflower cheese with roasted veg and with lots of other veg in shepherds pie. We got a large bag of carrots in Morrisons for 39p so if you look around there is cheap food.
Me and DH absolutely love lentils. One of our favourite meals is egg and lentil curry, easy to make, delicious and very filling.