Oh dear, what a mess.
Start by reading this, and then tell us what your company has in the way of a formal grievance procedure (it may not actually have one).
http://www.direct.gov...rocedures/DG_10027992
There's an ACAS Code of Practice on this but employers are not obliged to follow it. As a minimum, the employer has to tell you who you (as an employer) can refer to, in the event of a problem at work that you cannot sort out with your direct manager.
If you attempted to raise a grievance, I trust you put it in writing; if so what is the gist of what you alleged at the start of all this - is it that you were unreasonably denied access to a toilet and your manager made a racist remarks to you?
Moving you from one work machine to another, whilst annoying, initself is not normally something that you could raise a grievance over on its own.
Hindsight is a wonderful thing, but it unfortunately it doesn't help to lose your rag during the process by which the employer was supposed to be hearing your grievance.
Also best to stick to one thing at a time - and not try to chuck in H&S rules half way through the process.
That much said, they should still deal with the grievance - and reply to you in writing what the outcome is of the investigation - in line with the procedure (whatever it may be).
Then you say that you were suspended because of abusive language and behaviour. I assume this happened after you started the grievance procedure in writing? The company should write to you stating why you have been suspended, and what happens next. You should be invited to a meeting to hear your side of the story. Since the two people who you have been angry with are involved in the incident, someone independent should be dealing with the suspension. Is there an HR department / Personnel Officer in the UK?
That's enough for you think about for now. Oh, except forget the term 'constructive dismissal'. That is when YOU resign and then allege the company has breached your contract and can have some some money please. Not what you are after.