Thanks for the replies

Quote Originally Posted by catnapper
Is he in an out of the litter box all day long? If he is in the box, is he there for a long while? Is he obsessively licking his "privates"?

All those symptoms are sure fire clues that he's got crystals and/or he's blocked.
The answer to these is no, no, no. I know what you mean about being uncertain as to whether you are feeling a solid full bladder or not. While Max didn't appreciate being touched (in general) his undercarriage bits didn't seem unusually large and his 'swingy' flap seemed unaffected.

To be honest, what I'm really going on is his behaviour and vocalising, rather than any 'physical' signs. At the risk of repeating myself, Max can be a very strange boy sometimes and I sincerely hope its down to that. Update when I have it.

I should have a report from my dad soon - he's on his way to get the bathroom fitment we need and then will be at our house and report on the boy.
Thanks for your concerns xx