Well the Movicol worked well - I tried for ages this morning and only managed to let go of a couple of pellets but then the urge hit me (halfway round the supermarket!!)
I quickly found a loo and I did the biggest BM ever - it was so big I pulled the toilet roll dispenser off the wall whist gripping onto it for dear life!!
That was about 20 minutes ago and I'm sore but nothing major - 1 paracetamol should fix it. Certainly nothing like before. Whilst the BM was massive it was a lovely soft consistency so I think that's definitely helped so big thanks for the Movicol tip!