I've now heard back from Parcekforce.
They say they cannot (will not?) help without a tracking number, but the parcel doesn't have one. (it's not tracked)
So I now have the situation where my parcel has been delivered to an unknown private address,and Parcelforce have advised me of this, but say that they cannot help.
They;r also declined to give me a final impasse letter so that I can complain to Equalities Commission.
Time I looked up that CEO's e-mail address list I think!
I'm not sure I shouldn't have out this in Consumerwatch.