I've read a few answers here advocating asking for more during the initial salary negotiation. The amounts I see leave me dumbfounded, and I suspect it's because these answers come from a US-centric point of view. For example in Just got an initial job offer. How do I ask for more without any real justification? we get this piece of advice:
Always, always, always ask for more. It makes them respect you and you're likely to get it.
which is fair enough. This question links to a Reddit thread where a commenter says
I remember my first job out of college I was offered 45K and I was feeling confident that day and pulled a random number out of my ass for a counter offer. I told them 64K. They said 'sure' without even blinking!! Involuntarily, my jaw dropped and I got a big dumb smile on my face and said "REALY?! ... uh I mean.. uh... that sounds good..."
It is my feeling that negotiations in the US do lead to a higher salary compared to the UK, and I think that's because it's much easier to fire someone in the US.
So, does the same rule of thumb apply? Should one be asking for 5-10k more? How much more conservative are UK companies during initial negotiation? How can I translate all the US-centric advice to UK norms?