The
contact page gives:
Unit 8, The Gateway Centre
Cressex Business Park, Coronation Rd
High Wycombe, Buckinghamshire HP12 3SU, UK
Tel: 0845 834 0088
Fax: 01494 519123
Googling the fax number returns some links which give voice telephone numbers 01494 531100, 01494 461412 and 01494 464010. They give the name Regal Logistics Ltd, The Parcel Co Ltd and XDP. Royal Mail has only Regal Logistics Ltd at Unit 8.
Regal Logistics' website gives telephone number 01494 531100.