…To Ghost Employer

I would be writing her a letter explaining why and then not work notice. Personally, I'd want her to know why though.
I'd also talk to ACAS about constructive dismissal.

Amazing how often the first reply on a thread completely nails it.

Hand your notice in on your last day, detailing why you're leaving. So at least it can stir some shit !

Email HR and say you resign with immediate effect.

Realistically if you don't work your notice it's highly likely nothing will happen. But for your own financial health and to save yourself the stress, I'd let work know. You can always be signed off with stress for your notice period.

Yeah as tempting as it must be it will ne too messy. Just hand in your notice (today and email will suffice!) And then either work it or go off sick. It's not worth them withholding your p45 for example and messing up your tax. Also do not do these extras during your notice period. Turn up, do the bare minimum and log out on time x

Sounds like you have a case for constructive dismissal to me

Sounds awful OP, How people get away with this i have no idea but i agree with those saying don't just walk out.
You may need a reference in the future and they will probably hold back any outstanding pay.
Resign and get signed off, or work your notice but do the bare minimum with a smile on your face to wind her up as much as possible, and definitely put something in writing once you have your P45, Final salary etc. Good luck with the new job.

More context I think. In what way is HR not there for you? Tried to involve them or did involve them? What was the outcome of your grievance?

I would go off sick and get as much pay as I could from them.

Definitely what @NeverDropYourMooncup said and also @Madamecholetsbonnet don't give the LM any leeway to say you are unreasonable in any way and were a nightmare to manage. Whatever route you decide it definitely needs to include you resigning properly. It will give you more drama and headaches in the long term.
Good luck with your new job, I hope I've read it correctly that you've secured it. X

I got signed off then resigned. Most liberating thing I've ever done. References required for new job were character reference and a reference from someone I had worked closely with so asked a supportive colleague. Go for it, you won't regret it.

Email HR stating your leaving dates and that you're formally resigning so they can't sue you for breach of contract.

After they have paid your final salary,
email HR and the line manager of your boss the real reason why you left. Throw her under the bus with concrete examples of her poor work practices. Use very solid examples of her incompetence which can't be ignored.

I did this when I left a previous employer. They put my ex line manager on capability performance and sacked her several months after I left. I used solid examples & emphasised that she was bringing the firm into disrepute with her behaviour. This is what makes the ears of employers stand up, they care more about their reputation than they do about their staff.

Do you have another job to go to?

No she won’t. Just fill a P46 in at the new place, many send these in the offer letter and contract anyway. Tax office just work your code out from that, used to be my job when I worked for the (then) Inland Revenue.

Just resign and work out your notice. As others said you need your P45 etc and once you've hit send on your resignation email your LM's behaviour won't bother you quite so much anyway. Sit down and work out ways of dealing with her during your notice period. Do as much communication via email as possible. Don't work extra hours. It will go a lot quicker than you think it will and once you've resigned she has much less power over you. Good luck in your new role.

Resign, sending the resignation to HR and cc'ing in all your managers (including LM). Remember, you're telling them, not asking for permission.

Then just work to rule for your notice period. No after hours meetings (decline them), no rushing to different sites at the last minute. Place your phone on mute, face down and only check it twice a day. And so on.

What are they going to do? Sack you?! But take back some control while there is no risk to you.

I'd resign and tell them why, then get a Drs note for your notice period.

You need to submit a formal grievance as HR cannot ignore that.

I am very professional and only leave on good terms. As long as you don't ever want a reference or anything from this employer....I'd be be tempted to do what you're thinking. However, I think if I'd put up with it for 8 years I'd just go and work my notice so that references or anything shouldn't be an issue. If you walk out never to be seen again that's ammo for them not to give you a professional reference.

Get signed off sick and hand your notice in

You need to hand in your resignation one way or another to get your P45. Otherwise it can cause issues with the amount of tax you pay in your new role.

If you don't feel able even to send your manager an email, you need to contact HR so they can go through the process of terminating your employment, taking you off the payroll etc.

Officially they will expect you to work your notice, but if you have any annual leave left you can take that within your notice period. You could also see your doctor and ask them to consider signing you off work for mental health reasons, although to be honest, if you've stuck this out for six years I'm sure you can coast to the end for four weeks.

You need to resign properly as others have already said. You have options such as trying to negotiate down the notice period or simply telling them that you’re not working it.

This.

What you want is constructive dismissal.

But in order to have a strong case for that you need to show that you have tried to engage HR and you need to have a strong body of evidence.

Have you tried writing to HR listing all the grievances you have outlined here and asking them to act?

Have you got another job lined up already?

I would go to the GP and get signed off. Once you have a sick line, email that and the resignation letter at the same time.

I would also contact ACAS to see if this needs to go to tribunal.