[Icare9]

Four were buried in cemeteries in Friesland.
Name: WILLIAMS, JOHN KENNETH
Initials: J K
Nationality: United Kingdom
Rank: Pilot Officer (Pilot)
Regiment/Service: Royal Air Force Volunteer Reserve
Unit Text: 514 Sqdn.
Date of Death: 22/01/1944
Service No: 161058
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Row K. Grave 31.
Cemetery: STAVEREN GENERAL CEMETERY

Name: KEENEN, JAMES RICHARD
Initials: J R
Nationality: United Kingdom
Rank: Sergeant
Regiment/Service: Royal Air Force Volunteer Reserve
Unit Text: 514 Sqdn.
Date of Death: 22/01/1944
Service No: 1570038
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Panel 232.
Memorial: RUNNYMEDE MEMORIAL

Name: MILLIS, LESLIE NOEL
Initials: L N
Nationality: United Kingdom
Rank: Flight Sergeant (Nav.)
Regiment/Service: Royal Air Force Volunteer Reserve
Unit Text: 514 Sqdn.
Age: 22
Date of Death: 22/01/1944
Service No: 1334196
Additional information: Son of William Noel and Marjorie Ethel Millis, of Teddington, Middlesex.
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Row O. Grave 32.
Cemetery: WONSERADEEL (MAKKUM) PROTESTANT CHURCHYARD

Name: HENSHAW, DONALD FRANK
Initials: D F
Nationality: United Kingdom
Rank: Flying Officer
Regiment/Service: Royal Air Force Volunteer Reserve
Unit Text: 514 Sqdn.
Age: 27
Date of Death: 22/01/1944
Service No: 151014
Additional information: Son of Frank and Mabel Henshaw; husband of Phyllis Mary Henshaw, of Munstead, Surrey.
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Panel 206.
Memorial: RUNNYMEDE MEMORIAL

Name: PRATT, ARTHUR
Initials: A
Nationality: United Kingdom
Rank: Sergeant
Regiment/Service: Royal Air Force Volunteer Reserve
Unit Text: 514 Sqdn.
Date of Death: 22/01/1944
Service No: 914246
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Panel 236.
Memorial: RUNNYMEDE MEMORIAL

Name: LANE, ERNEST ALLAN
Initials: E A
Nationality: United Kingdom
Rank: Flight Sergeant (Air Gnr.)
Regiment/Service: Royal Air Force Volunteer Reserve
Unit Text: 514 Sqdn.
Date of Death: 22/01/1944
Service No: 932746
Additional information: Son of Ernest Alfred Lane and of Nellie Alan Lane (nee Bark); husband of Dorothy Mary Lane, of Winnipeg, Manitoba, Canada.
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Row O. Grave 39.
Cemetery: WONSERADEEL (MAKKUM) PROTESTANT CHURCHYARD

Name: CHAPMAN, WILBUR HENRY
Initials: W H
Nationality: Australian
Rank: Flight Sergeant
Regiment/Service: Royal Australian Air Force
Age: 26
Date of Death: 22/01/1944
Service No: 417157
Additional information: Son of Samuel and Harriett Chapman; husband of Isabel Jean Chapman, of Dawson, South Australia.
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Plot D. Row 1. Grave 1.
Cemetery: HINDELOOPEN PROTESTANT CHURCHYARD
It may give you more if you can access the RCAF and RAAF Service Files as they contain not only the RAF records but also some of their own, and can give a fuller picture. If you can't Google the contact details, I'm sure some Pal will oblige!