Finally, a response to a stiff email I sent, demanding my money back...
"Hi,
Thanks for your e-mail, I have just checked this and the Dell E5410 had a fault and I ordered some more stock and I have a Dell Latitude E5510 but has no webcam
I can do a Dell E5450 with webcam but it is 14", let me know If this is ok or If you prefer a refund"
I preferred a refund.
"Hi,
Thanks for your e-mail, I will process a full refund today. I am very sorry for this"
So seems genuine but struggling, and communications no good at all, as did not keep me informed of developments at all.
Now waiting for the refund to appear - probably not until Monday... Glad it wasn't an actual scam.