Indeed, but I'm a bit confused - it looks as if the fabric-cover tailed tails and the PVC ones are in parallel, between the meter and RCD. If so, they need replacing by just one pair, of appropriate size!
As I suspected
Yes, 'safe' in terms of providing adequate fault protection to all your circuits, which is (I presume) what Lectrician was primarily concerned about. The absence of a time-delay is not so much a matter of hindering diagnosis, but more a matter of the theoretical hazard it presents - because a fault on, say, a sockets circuit could result in the whole house being plunged into darkness, perhaps whilst you were up a ladder, holding a pan of boiling oil or whatever! It's a very small 'hazard', but since you need to get someone to sort out those tails, I would think that you might as well get the RCD changed to a time-delayed one at the same time (if you can't get upgraded to PME, in which case you wouldn't need that RCD at all).
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