We had a thread last week about 'Practicing' a Universal Credit claim.
There is now a newly started petition to try and get the DWP to implement an official 'Practice' version of the claim process, so that people can try it without actually making a claim.
https://petition.parliament.uk/petitions/228834
I encourage everyone on ESA to sign it.
(Especially if you have IR ESA or an IR top UP, (ie. any premium).
As the plans for migration currently stand then you will have to make a UC claim come Managed Migration time, starting July 2019.
Being able to have a practice before doing the actual claim will be a great help.