Do not write it. A voluntary resignation is almost impossible to challenge. Record the pressure (correspondence, witnesses, recordings) and speak to a lawyer: forcing someone to resign is unlawful, and that argument works in your favour.

One month from the day you are handed a copy of the dismissal order or your employment record book. The deadline is extended only for good reason, so it is better to act at once.

Reinstatement or a change to the stated grounds for dismissal, average earnings for the whole period of enforced absence, unpaid wages and compensation, and in certain cases damages for distress.

A written demand, a complaint to the Labour Inspectorate and a claim in court. If you were dismissed, average earnings are recoverable for the period the final settlement was delayed. For wages that were calculated but not paid, there is no time limit for going to court.

Yes, but first the employment relationship has to be proved: witnesses, access passes, correspondence, rotas, regular transfers to your card. It is harder, but entirely realistic. After that you can demand both formalisation and payment.

Reinstatement cases are heard on shortened timescales, in practice from a few months. Some disputes we close by settlement before a decision. We can be more precise after reviewing the documents.