@Pen-y-gors Re: Some sympathy -but not a lot
"Having recently had a 5-day outage at the bods who do some of my hosting (how often do both drives in a RAID setup fail at the same time?"
When they're from the same batch, same make, same model, same usage pattern (RAID-1 would suggest exactly that by design)...
...quite often actually. One of the (many) reasons we mix drive models/batches/makes in RAID arrays