Hi Pindie68, UC is such a pin in the butt, excuse the pun but it is. Hope stuff is working out for you though.
Have been there blocked and going at the same time, Geez what a trip! I cut out fibre and added lots of water, and I hate water, unless it has had hops soaking in it 
My journey started 16 years ago, been a pretty rough road for a while, what with specialsts saying time to get rid of all my colon, I jumped onto the NOPE train straight away. Even went down the azathioprine path near bloody killed me...
After 13 months of being anemic from blood loss dropping heaps of weight & bi-weekly blood test (started to look like a junkie from needle marks) found this little gem "e407" food additive. Google that bad boy!
I then became aware what this stuff is in and it is very surprising what it is in, did a nil by mouth for 17 days, a bit hard but what was the other choice?, GP did not like it, but it did pay off.
It seems if if you can give the old colon a few days off it will start to repair itself, clearly that means no solids for a while, I believe in the UK at the first sign of UC youre in Hospitial for 15 days with Nil By Mouth, thats were I picked up on it, had a visting UK doctor at local clinic, they would not do that here in Australia unless youre knocking on deaths door, even then it would be a coin toss.
Now in remission for a 12 months, living the dream.... using Salofak and 25mg Prednisone daily.
Big thing is to try live a stress free day (yep hard when youre leaking claret) and in heaps of pain. Only fellow UC'ers would understand.
I found dairy was a bugger, tried lactose free milk and that worked, investigate if you diet has E407 and get rid of it.
You should be able to get weened off the steriods soon, but may have to keep taking the mesalazine (Pentsa Salofalk) for ever.
Just remember UC WILL come back, sooner of later, the thing is just keep looking for it, as soon as you potty habits change get down to the GP and get that prednisone into you, lots of water & soft foods (no corn) to take the pressure from the colon.
Just remember you have to look back to go forward.
Good luck...