Okay, I fear I may be stumbling at the final fence. I have both sides filled including the thematic clues.
I have the four words the extra letters spell out but I wouldn't exactly call it an "instruction"!
In addition, as far as I can tell, Gary .....and Do... are 50 yrs old and Mary and Ru.... are 100 yrs old but I doubt they're going to be "clue numbers" - what else could it be?
Lastly, I'm not sure of the parsing for the "stores securely" clue - I can see "F(ellow)" and the "internet address" but I can't even find the answer in Chambers, at least not as a specific entry but as a variation on a word meaning "roll up" - is that "stores securely"?
Help!!