I needed the follow up laser treatment to clear up posterior capsule opacification about a year after having my cataract op - in my case (as I believe is the norm for PCO) the symptoms were similar to the cataract itself, with my vision in that eye becoming noticeably cloudier as the PCO developed.
I wouldn't have described it as blurriness in the same way my vision is blurred when I take my glasses off, but I guess the cloudiness could be described as a blurriness of sorts.
In any case, PCO isn't an uncommon thing following cataract surgery, and the treatment is quick and simple (eye drops in to dilate the pupil, lie back, look at the little dot, flash flash flash for a couple of minutes, and job done), so if this is what your OH has then it's nothing to be worried about.
That said, as someone who's also spent time being treated by the Moorfields team at the main City Road site, whilst I know what you mean about them sometimes being a bit short on time to discuss things in as much depth or clarity as you might like, their reputation for being a world class opthalmic hospital is well earned, so I'd have been less inclined to think there was any need for a second opinion. I'd certainly at least be giving the drops a fair chance to see if they do clear up the problem before assuming it's something else. And if it does turn out to be PCO, then delaying treatment will just mean the cloudiness develops a bit further and becomes more of an inconvenience, but there's no risk in leaving it, and the treatment is the same regardless of how developed it is.