Nikki went for her check up today - she's HEALTHY!
Her red blood cell count is perfectly normal and has gone up quite a bit again since the last time - and her platelet count has doubled!
And as for her weight - she was 4.35kg last time she had a check up - now she's
5.22kg 
I just hope our floors will support her weight!
We can reduce her dose of the steroids now - from tomorrow she'll be having one and a half per day instead of two - and if that goes ok then we can try one a day!
We took Sparkle along too - he's been displaying un-neutered tom-like behaviours lately, including his great escape - so he had his bits felt just to make sure it was done properly!

It was - the vet just thinks he's still acting up after the move, and he's got some stress-reducing tablets to take (along with the feliway we're already using) to see if that helps with his naughtiness and attention-seeking. Fingers crossed!