Hi there, please find below the answers to your questions:
1. Assuming the company sick pay entitlement is a contractual right and you have satisfied the conditions, then yes, they would be obliged to pay it. The only caveat is that this should not be discretionary sick pay, it has to be guaranteed, so the entitlement should not give the employer the discretion to decide whether to pay it or not. If it was discretionary, they could potentially decide not to pay it.
2. You can resign at any time, even if on sick leave. What you are entitled to in relation to notice pay depends on several factors. If your notice is within the initial 3 weeks of sickness and the employer is paying you sick pay then your notice will be covered by this sick pay entitlement. If you are outside of the 3 weeks full pay sickness period then your notice pay will depend on what notice period the employer should have given you on termination. If that notice period is at least 2 weeks or more, then you only get SSP during the notice period if you remain off sick. If their notice period is less than 2 weeks then you are entitled to full pay for the notice period even if you remain off sick and have used up the sick pay allowance.
3. Yes, you will be entitled to get paid for any accrued and unused holidays you have at the time of leaving.
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