So nothing Iran has could possibly sink one of these, were they so inclined.
I'm sure you guys aren't saying they're impervious to harm, but that's the impression you're giving
Saturation attack potentially could be a thing - but Iran would also need to know where the ships were roughly even with (fire and forget) "smart" munitions and if their aerial assets are locked down that becomes much harder. So far the systems on the Type 45 have proven effective against the real world performance of much of what they'd potentially be up against which is often lower than the headline potential figures i.e. some missiles might be capable of say Mach 5+ on paper but realistically can't exceed Mach 2 in any useful combat way if you actually want to hit a target.
Also Type 45s have a tiny radar signature which helps to make them more resilient.