Ron Griffiths said that the sound snippets edited in for The Iveys - Christmas Record (1968) were taken from an LP by the Goons which was around at Golders Green.  
 
Ron Griffiths:  From either the first two Goon Show albums - I think they were called "The best of the goon shows vol 1 and vol 2" 
 
 
The Iveys - Christmas Record   opening & closing
taken from  The Best of the Goon Shows No. 2     Side-B. The Scarlet Capsule 4:32- 

 
 
The Goons: ‎ Spike Milligan, Peter Sellers, Harry Secombe 
 
The Goons / The Best of the Goon Shows No. 2 
   Voice Acto: Harry Secombe, Peter Sellers, Spike Milligan 
   Voice Actor [Announcer]: Wallace Greenslade 
   Conductor: Angela Morley 
   Producer, Liner Notes: John Browell 
   Written by Spike Milligan 
Side B first broadcast on BBC Home Service on February 2, 1959 
Side B is a parody of the British science fiction film "Quatermass And The Pit" 
 
1960/   LP   Parlophone:PMC 1129     Side-B. The Scarlet Capsule 
The Goons ‎- The Best Of The Goon Shows No 2 a
The Goons ‎- The Best Of The Goon Shows No 2 b
The Goons ‎- The Best Of The Goon Shows No 2 c
 
 
 [Acetate] Iveys Christmas Record (1968)