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Its alright and has boxes, you think £300 is alright?
As I said I'm no expert when it comes to Bronicas but I looked at eBay sold listings and other second hand sites, and see they're usually going for more. Like this one https://www.ebay-kleinanzeigen.de/s-anzeige/zenza-bronica-sq-a/903892822-245-1036
300 for camera with that lens, two backs and grip is fine. If it all works fine.
The question is are you willing to take the risk / are you trusting the guy.
And do you really want to spend 300 on a heavy, bulky 6x6 system camera. Is this really what you want?
Don't get me wrong, I love this kind of cameras, but it's just suitable for a small number of occasions, and it's heavy and expensive to shoot - prepare to burn a lot of money for film and dev / scan.
I'm not an expert on Bronicas, but if everything is in good condition this is a good price.