Resignation letter or email?
Acas says resignation does not always have to be in a letter or email, but an employer may have a process to follow and your contract can matter. A written record can help avoid disputes about notice.
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GOV.UK says your contract will tell you whether notice must be given in writing; otherwise it may be possible to give notice verbally.
Email can create a useful record
Where email is acceptable, it can provide a dated written record of what you told your employer.
A formal letter is still useful
A letter can be appropriate where your workplace expects formal documentation or you want a document suitable for printing or keeping.
The important content is similar
Whether delivered as a letter or acceptable email, make the resignation, notice period and intended final date clear.
Ask for confirmation if useful
Acas suggests asking an employer to confirm in writing that they have received the resignation if you want a record of receipt.
Official source: GOV.UK: giving notice. Employment circumstances vary, so check current official guidance where necessary.