Just had a look in the 'Winter 2008' issue....as you say only mentions 22nd Company....do you have your grandfathers service records? This would give you the units he served in with dates.....as the 'official historian' of the 21st Fred W) doesn't include an Ellery in his list perhaps he joined after Arnhem??? If you don't have the service records as NoK you can get them from the Army Records Offcie at Glasgow......