Have had a job offer via a recruitment consultant today. The role itself sounds great and offers better career progression than current role but have been offered just £500 more than current salary which hit a bit of a bum note. I'm expected to negotiate but I've no idea what is reasonable. No salary range was advertised for the role. I've been with current company for over 20 years so feel like I also have to factor the loss of that security in too.
I'm currently on £60k+ and as the role is offering more responsibility I'd had in my head around £70k before being told the money bit, so the low offer was a bit of a shock. It's quite a niche role so difficult to benchmark. What sort of % is reasonable to negotiate?