That was a sarcastic amount from that poster, £250 is too cheap average cost of a like for like combi swap is normally in the region of £600+ for a proper job done to spec and system cleaned ect.
I personally would steer clear of someone qouting that cheap, it wil cost you more in the long run.
The reality is that there are many people who will fit boilers for that price!
In fact they don't do badly at all because they fit it in one day, don't do any power flushing, don't use any expensive chemicals and get paid and then they are off ( never to be seen again! ).
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