I have self represented in tribunals before - well, I was representing my husband.
If you self represent it is actually completely cost free to take an employer to court. Except for the time to prepare etc. Your employer even has to produce the bundles and get you a copy. In fact, employment tribunals are SUPPOSED to be fully accessible for people representing themselves, because the maximum amount of compensation available is usually not enough to pay the solicitors fees, as we have seen from previous cases!!
But it's gruelling, and galling. In my case, the judge was really rude and abrupt and seemed very impatient with me. My husbands ex employer bought a Bristol based barrister with a clerk, there were several witnesses and my husband only had me - it was a further extention of the bullying process, really, and it cost them a lot more to put us through it than it would have to settle.
Of course, your employer can also choose not to spend £££££s on barristers and either send a highly competent member of their HR team, or settle, instead. In most cases they do.
The whole process is rhubarb. Big companies don't have much fear of tribunal process because awards are so small. There should be other ways to get fair treatment from employers, if you ask me!!