Always risky to advise others how to spend their money because it could easily go either way there. All I would say is that if it was my money I would wait because a fare at that level is going to be available to you several times between now and what is still quite a while away. I see that BA currently have a more or less identical fare on their website and that comes down to £498 if you put your dates forward a couple of days.
There will be sales around the Christmas/New Year period so, if it was me, I'd hang on for a while. Of course, it isn't me so it's your call!
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