They have been very naughty in claiming £50 legal representative's costs - yet the documentation is to be sent to them rather than a legal representative. A search for Angelika Brzozowska shows she is "Head of Legal at UK Parking Control (UKPC)" (i.e. the tea lady). Make sure the question of this fictitious cost is added to your defence in mid-September.

Agree that Trade Union or employment expert advice is required ( ACAS are good at offering information on employment rights, if you speak to them) You need to start putting together a folder of evidence. Get hold of your contract of employment documents, if you don't have them. Also get hold of all records related to your performance against the targets you were set. Start to record all interactions with your managers and HR. Insist that all meetings have minutes taken and agreed. If you end up being dismissed due to failure to meet the performance level expected by your employers, you need arm yourself with as much evidence as you can obtain, just in case you wanted to take it to employment tribunal.

Are you in a union?