I work in the UK, my line manager is in France, but department head is in the UK. I've worked in the same role for 12 years. My line manager has been in his role for three months, with the manager he's replacing still in the process of handing over.
I have received an offer of employment from another firm, with a formal offer letter, and a contract with a provisional start date, based on a projected end date using my full notice period (3 calendar months). I have accepted, but not signed the contract as yet.
Spoke with my line managers and department head to give verbal notice, and agreed to a final day of 31st October. Sent my formal notice email to management and HR that afternoon, and it was accepted the next morning, with confirmation of 31st October being my final day.
My new line manager is now attempting to put conditions on that early leaving date. Over the phone, we had agreed that he expected me to complete certain tasks, and handover duties, which I expected, and seems to be nothing out of the ordinary.
Via email, his list has expanded, and though it's all seemingly feasible, he's left the door open to adding more, with the words "to shorten your notice period here are the list of items we need - at least - to be completed", and "each point is not exhaustive". He's also scheduling a meeting for early October to discuss my actual leaving date.
I'm unsure whether I should sign a contract with an earlier leaving date as yet, considering my line manager is attempting to add conditions. I'm also unsure whether he could change my leaving date in this manner.
After cooling down, and before hitting send on a slightly heated email, I've searched for information about this, but most hits just mention "notice periods are negotiable", and that I should sign the contract before handing my notice in.
For all the calm and collected people out there, how should I respond to ensure I don't come across hostile, but to ensure I don't get treated like a door mat, and am left having to revise a contract again?