Officers investigating the murders of the Reverend John Suddards and Betty Yates are appealing for the public's help in locating a rucksack and a mobile phone.
Police believe the missing rucksack and phone could be vital to their investigations and may be on farmland or in an outbuilding or barn in the South East, potentially in the Eastbourne area.
Officers are appealing to farmers to check their property for these items which may have been discarded some time between Tuesday 14 February and Saturday 18 February.
The 'Eurohike Hydro' rucksack is olive green and black and has a distinctive orange belt clip on the side straps which doubles as a whistle.
If anyone finds this bag they are asked not to touch it but to contact the police immediately as it may need to be preserved for forensic evidence.
Police are also looking for a missing purple Blackberry 9300. If anyone knows the whereabouts of this phone or has been offered one for sale since Tuesday 14 February they are asked to contact the police.
Reverend Suddards was found dead in his home in Thornbury on 14 February. Betty Yates was found dead in her home in Bewdley, Worcestershire on Wednesday January 4.
Stephen Farrow, aged 47, has been charged with murder and remains in custody at this time