For starters....................welcome.
Have a look at this for things to look out for https://www.two-sixties.co.uk/mgoc26...4-Did-you-know
With regards to the price, is it private or trade, SE spec or non SE, FSH or not?
General condition, colour they all play a part.
If it's the right car for you go for it, if not.................keep looking.
In the end the price is what you're prepared to pay for it, not what the seller wants