I'll add to Alber Ratman's post there and advose you to contact Terrane
Terrane Ltd. - Official Supplier to the World's Armed Forces
As one of the few 'Grand Slam' members of the all of the RAF's OEU's of the period, Strike Attack OEU, F3 OEU, Fast Jet and Weapons OEU and 41 (R) member, I can confirm that Terrane has produced many different versions of combined GR4 and GR7 poster, and they are all of the quality you would expect from Terrane.
Flipflopman