COSORI - 5 QT Smart Air Fryer (9-in-1)

I've got a cosori 4.7ltr and its perfect size,can fit a whole chicken in it,and it's only about£90,check it out on amazon

Well, the older design is still available to purchase new so based on your description, you've bought an older design. Which has a fully removable basket, as compared to the newer models that have a grate/plate at the bottom of the unit that is removable for cleaning. I also prefer the older design because there are times grease or drippings stay in the bottom while I use the removable basket to take out my food. 

I used to have a cosori countertop one which was fine but definitely not BIFL. Just moved and new house has in induction range where the oven includes a convection oven which works beautifully as an air fryer and feels pretty sturdy like a well made oven that will last many years

I have both, Ninja oven style, Cosori basket style.  I quit using the oven style 6 months ago. Oven style:  Basically a small oven.  Only thing it does better is larger pizza, more cookies.  It heats from top and bottom, so no flipping.  Has window so you can watch stuff burn. More "stuff" gets spattered on all 6 sides, including more fragile heating elements ("stuff" hard to or won't clean off).  Can get hot on top.  No non-stick. Basket style:  Better/stronger circulation. Food cooks faster & gets crisper. It's MUCH easier to clean non stick surfaces (1 minute after each use).  Fan is quieter (at least on my Cosori Turbo).  A cheap toaster is a must.  My Cosori was half the price of the Ninja, does a much better job, and takes up less countertop space.