What a start to the day!

That's where ours blocks as well G&T - but we usually get a bubbling sound in the shower first as a warning.

Ruby, are you able to lift one of the manhole covers outside to check where the blockage is. If it is blocked outside, nothing you do in the bathroom will help. If you have a shared sewer system, many are, the water company is now responsible for it, just ring them.
If the manhole is clear, then try the things previously recommended.

Ours often blocks, but that is outside/shared and Anglian water come out quite quickly to clear it.

Pour a bucket full of water quickly down the toilet so the force of the water pushes the blockage round the bend.

Good luck at the hospital later

I've read that putting lots of washing up liquid down will help [maybe with some boiling water; I'm paranoid about my loo blocking after the last time it happened so I squirt washing up liquid down it on a regular basis. Agree about using a super mop as a plunger; I always keep an old one for that so I can throw it out afterwards.

That's what I do at work anno. It's always paper blocking the loos there. Your hand is a much better tool than anything else. Good luck today with everything ruby.

Tie a black plastic bag around your arm and plunge your hand round the bend. That was a tip from Aggie McKenzie (or it might have been Kim Woodburn?). I haven't had to try it...yet.

In our house it's usually due to quantities of loo paper (DH likes the Aloe Vera type which seems to disintegrate more slowly) so I don the rubber gloves and use an unbent wire coat hanger. Good lock. A plunger is also a handy gadget to have, but merlot's advice is one I will remember for future use!

ruby, try tying a plastic carrier bag around the head of your mop and using it as a plunger.

Hope it works.