Found Jack Lott's article in Gun Digest 1981, page 171. He wrote 41 years ago that the post-WW2 W-R "Game Ranger" rifles lacked the cartridge retaining clips and the careful handfitting. They earned some fame for unreliability because the bolt tended to override the rebated rim of the .425, especially when worked fast in an emergency, causing a solid jam.
I have seen several early post-WW2 British rifles built on German military K98k actions, made not only by W-R, but also by Holland&Holland, Rigby and others. Apart from the typical styling a H&H .375 magnum rifle was of dubious workmanship: Checkering cut lopsided, inletting just so-so. Have also seen a .416 Rigby on such an action excessively opened up. As nearly nothing was left of the lower locking lug recess, the bolt set back after some use. Now the rifle shows excessive headspace. As the supply of original Mauser Oberndorf commercial magnum actions was no more, even "name" British makers used any action they could get.