My father was in the 6th British airborne division in ww2,I have his army n...

My father was in the 6th British airborne division in ww2,I have his army number,how
He was at Pegasus bridge,he was in one of the gliders that landed close by the bridge,
Sadly he died at the age of 93 about 4weeks ago, I discovered a book written by Denis Edwards called the devils own luck,about the raid on the bridge,in the book there is a part that has all the names of the men that took part in the attack on the bridges,sadly my fathers name was not in it ,the closes name to his is hook,my father said that they often spelt his name wrong (Edwin hark), I want to know how to find out about my father in the war,I have his service number,can someone help me please as my father would never tell a lie about his time in the war,in fact it's only in his last years that he actually spoke about it,,so again can you stear me in the right direction to finding out about him.
Thank you

My father told me that he waded in the sea ,water up to his neck,waiting to get on a boat home .he did this three times ,but had to go back to the beach,when the enemy planes came over,on the fourth time he managed to get on a boat,it was a paddle steamer ,