I need to know urgently please! Attached photo of the itinerary.
Just go on the BA Website.
-> Then go to "Manage my Booking".
There you have to enter the Booking reference and your last name, which I assume you know. If it lets you manage your booking, the itinerary is genuine.
Since I'm not yet allowed to comment, this is to supplement Daan van Hoek's answer. The concern seems to be whether the "booking reference" is known. The image in the question shows a blacked-out item labeled "PNR". This is the same thing as the booking reference. It should be six characters. If OP is the one who blacked it out, then it should be possible to enter it in Manage My Booking.
It is unclear what you mean by "genuine".
It's a valid itinerary for this date and price. These flights do exist and you can book this exactly the same way on the BA website.
We can't tell whether the specific booking is valid. That's up to the person who made the booking.
It's certainly not the cheapest way to get from CHS to LHR on Thursday.