My cat just fell out the window...

Roo is 13 years old. Ron? is 9 months.

She does not like him, and although she doesn't attack him, she's very vocal. At 3am.

We've tried feeding them nice things at the same time (blocks of coley - cheap, cheerful, and they love it), which just ends up with her growling, yowling and hissing with her mouth full.

BQ - you seem to have the cat whisperer knack - what's your suggestion for bringing peace to the house?

Ron? bites faces a lot too. Although this doesn't bother me so much, as it's not my face that is being bitten.

My solution would be not getting the second cat, but it looks like you're too late there.
Unless they are siblings who've been together since birth Cats rarely get on.
Both neutered I assume? Just give it time, make sure they both get the attention they crave.