Please contact the Land Registry at Gloucester, on 01452 511111 to obtain relevant enquiry forms, or alternatively on their web site at www.landreg.gov.uk NB They can only assist if property/land has been registered with them.
Since 1974 it became compulsory for property and land dealings to be registered by solicitors, if however the land is not registered then enquiries with local neighbours or parish councils may be able to help identify owners.