Trying to buy a car - I need a mechanic to come with me

Hi there,

I wish to buy a second-hand car and I'm looking for a mechanic to come to view it to give me their opinion? I think this is what I should do. The car being sold is old and the inspection has no advisories and runs out in July 2022. Do you think if it has passed inspection with no advisories it will be okay for a few months or should I bring a mechanic. If so can anybody recommend a trustworthy mechanic and roughly what can I expect to pay for this service? 

Thank you in advance for your time.