FWIW - I've just checked my LB (1943 not 42 though). It has birch woodwork throughout with a pretty dark orangey brown stain as Roger mentioned above, as dark if not darker than the walnut on my BSA. The top handguard is plain not grooved and it has a steel butt plate.
What I've always noticed when ever I use it, is that the fore-end seems noticeably "fatter/heavier" in the hand than either my BSA or Maltby examples which are walnut and beech respectively. Strange!