Thanks for the help guys. In the end I've decided not to claim on insurance, I've weighed it up and the impact of doing so, along with the hassle and time means I don't think it'd be worth it in the long run.
I went ahead and ordered the replacements yesterday, video rendering on old computers doesn't work well at all, so I needed it back up pretty quick. I'm in the process of leak testing it for 48 hours now, wouldn't want it to leak twice in a week.