Firstly, here are three comics adverts for this promotion, each one published on 10th June 1972.
Full-page ad in colour from "Look-In" No.24
Half-page colour ad from "Teddy Bear"
Full-page black-&-white ad from "Valiant and TV21" — I'm guessing you don't need to read it all again!
I expect you'd like to see the Iron-On transfers. I only have one myself, but can show you a couple more; the 'giant' one is 8" x 5":
Scan courtesy of Wayne Ratcliffe
The text along the top right-hand edge reads: "© 1972 Beaverbrook Ltd. Printed by Letraset".
The seven smaller ones are each about 2" square.
Photocopy courtesy of Wayne Ratcliffe
Picture Credit: The SPLAT Scan Archives
© Tom Vinelott 2021