So far I have bought:
1) SSD for sentry (UGreen SD Card Reader £13 and SanDisk High Endurance 128GB mem card £22 from Amazon)
2) Coloured mud flaps from Torque Alliance - you may not want these if the black ones look ok with Grey
3) Also got the door-open button stickers for £8 from TA - I couldn't find the blessed button on the test drive so I figure passengers might need a bit of help as well!
3) We've a small dog rather than small kids so dog cover for the back seat. Might do for small kids as well
4) All weather mats and trunk mat
5) Jack pads from Amazon
6) Tyre inflator from Amazon
I haven't got the car yet so I'm sure I'll find more stuff I *need* once I do.
Hope you like the car!