Thank you, that's promising news, although as of this moment I'm still getting the same error!
I'm about to head out for the weekend so I've missed out on this week's chance to continue the research I'm working on (and really enjoying) which is frustrating, but talk about a first world problem!
BTW I've messaged FindMyPast to advise them of the issue so hopefully they're at the very least aware of it and all comes good for everyone soon.