What does Monty normally like to eat flavour/ consistency wise?
Have you tried all the RC wet flavours: Beef, Chicken, Tuna? And the other renal diets?
I currently have 2 cats with CRF: Martha 23 & Metoo 16.
Martha was diagnosed in Jan 2007, she eats 1 x can Hills Chicken Minced & 1 x pouch RC Beef a day!
Metoo we adopted last summer, already in the mid-stages, he has very little appetite and is very thin now.
He grazes on the RC Dry and I liquidise a RC Tuna pouch with some water and he laps some of this during the day.
I tempt him with all sorts - Applaws, Gourmet Gold, Bozita, Pilchards in Tom Sauce - warmed for a few secs in the microwave.
Of course, just when I've completely given-up, I catch him polishing off the remains of an Adult Felix Pouch, that's been left to curl up at the edges in one of the other's bowls, that I've forgotten to wash-up that morning.
Main rule of thumb - if all else fails, let them eat what they want!