To be honest you can eat well on a lot less than that if you have to.
For a family of 4- Myself, OH and 2 DD's plus the 2 cats we spend between £50-80 a week depending on what is needed (ie:toilet rolls etc).
If you buy a huge chicken it can easily do 2 meals. So a roast one day then make the rest of chicken next day into a chicken curry.
We buy most fruit/salad/veg from saturday morning market. It costs half of what supermarkets charge and is much more fresh.
We only buy decent cuts of meat but do try and buy bulk so we can freeze some.
We will buy a huge joint of beef and divide it into 2/3 so we have more in freezer for another day..
Same for mince. We buy the biggest pack of lean mince then halve it to do 2 meals.
We also do a lot of thinks in the slow cooker like sausage casserole/beef stew/spag bol etc which we bulk out with a lot of veg so it is filling.
We don't tend to have to have meat with every meal either. We will make jacket spuds with tuna and salad, or cheese and beans. Or make a cauliflower and broccoli cheese with potato wedges etc.
I think it all depends on the meals that you do.
If you are happy with what you are doing then carry on.
Oh and you can make healthy, filling meals without paying the earth.