I started a new job a couple of months ago with a small organisation (<20 employees) in a "junior" role (my first full time job after a PhD). I am still technically within a 6 month probationary period and live and work in the UK.
The HR manager approached me recently. Apparently for juniors they usually specify a notice period of one month in the employment contract (time that they have to give me or I have to give them before leaving); however in my contract they apparently made a mistake and the wording said three months. I was told that this is usually reserved for management and more senior employees.
The manager made it clear that they wanted me to change to a one month period. They initially approached it as "we made a mistake so I will give you a new contract to sign", expecting me to just go along with it. However upon my response (namely that "I would like to think about it") they changed their tune and made out like sticking on the three month would be an option. Obviously I am aware that my employment contract is a legal document and I didn't want to just downgrade the terms of employment that I agreed to without some further thought.
Obviously three months is much better for me as it would give me more pay and time to look for a job if they want to let me go (although by all accounts things seem to be going well so I am not worried about this). However I am worried about how this would be perceived and if it would be unreasonable for me to stick to this? It seems like it was a genuine mistake on their part and part of me feels bad for taking advantage of this.
Am I within my rights to stick to the three month notice contract and should I do it, or should I sign the new contract? If I stick to the current contract will this impact me negatively in the workplace? Will I be judged?