How to negotiate salary increase on a secondment?

Posted by Lillybet89@reddit | AskUK | View on Reddit | 7 comments

Hi, I’m been offered a 8 month secondment within the same industry, it’s a grade higher than my current role and lots of additional requirements and responsibilities. My main thing is I earn £36100 and they’ve offered £36500. Which is just not worth the sheer amount of extra work for £400. How do I put in writing to justify asking for more? I’m dyslexic and terrible as writing something like this, so all help is appreciated please.