Case replacement on inspiron

See above -- if in the U.S., try parts-people.com

However, this is a very new model for which parts may not have reached the third-party sellers.  You may have no choice but to call your local Dell office and ask for "Spare Parts".  Most of these are still under warranty, meaning instead of being scrapped and replaced, they are repaired - which in turn means that the parts aren't available in the aftermarket just yet.

On the part(s) you need to replace you'll find a Dell part number  you can use to assist in  your search.

The # is 7591 hope this helps. The only problem is that I'm in GB. 

Where can I find the part# inside or out? 

Thanks found one on the dell UK site! 

We need the exact model number to recommend a replacement part - the 7000 series encompasses many models, all different.

Is it a 7559, 7335, etc?  The model number is on the label on the system base and on the setup screen.

If you're in the US, parts-people.com should be able to assist with the purchase of the part.

It's on a label on the part itself (you'll need to do quite a bit of disassembly to get to anything on one of the external plastic parts)

here is one EBay listing

https://www.ebay.com/i/264869357675?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=264869357675&targetid=935083617107&device=c&mktype=pla&googleloc=9003434&poi=&campaignid=10454521883&mkgroupid=104612010380&rlsatarget=aud-622027676388:pla-935083617107&abcId=2146002&merchantid=118847392&gclid=CjwKCAjw_sn8BRBrEiwAnUGJDlz0XYivvdW8JrYOLjYS2HLJru_BnsTI5P4768j9uKsTUx8NRPkgQhoCOIcQAvD_BwE