Thought it might be - vets seem to love it over here!!!
Well, if I'd had the opportunity to change over gradually I would have - but the trouble was, after 3 days, Harry hadn't eaten a thing and I was getting so worried that I just put down a bowl of RC and he wolfed it down....not an ideal way of doing things, but I must admit he's never, ever had tummy problems with either that or Lilys.
A little tip - when she's doing her wee-wees or poo-poos in the 'right' place - say "GOOD wee-wees, GOOD poo-poos" and have a little party....eventually (when it's raining etc!!!) you'll be able to take her out and she'll go on demand - very helpful!!!