Level attitude
Looking at the number of VOR's that have been retained I don't think that any place in the UK will be out of range of less than two of them if you are above the MSA.
Why would GPS result in people getting lost ? In terms of reliability is the ADF better ? ......... I think not !
And finaly why should a navigation equipment failure automatically result in a PAN call ? Simply telling an ATC unit that you have a system failure will result in assistance that will avoid an emergency situation not create one.