If Laker were to play now, he'd be considered wholly average, I can categorically assure you of that.
If Ashley Giles' career were to have formed in the wet 60s (when Derek Underwood's career started, and in which he began averaging something like 17 per wicket) he'd, I can equally surely tell you, be considered an all-time great in the manner of Laker.
Some people can't comprehend that, it just will not register that spin-bowling is a totally different kettle-of-fish, and it's very unfair on fingerspinners of today to say that all these former bowlers must have been infinately better than them.
How can it possibly be coincidence that before 1970 there were plenty of great English spinners (Rhodes, Blythe, Verity, Lock [everyone always seems to forget him], Laker, Underwood) - and no-one after? It can't. Yet it is simply beyond comprehension for most that Emburey, Edmonds, Giles, Croft and the like could conceivably have been as good.
We don't, meanwhile, know how Warne, Murali et all would have fared had there been spin-friendly conditions occurring with the regularity they occurred with before 1970, let alone before 1930. The fact that Grimmett, O'Reilly and the like had figures that were merely as good suggests that Warne and Murali might be better, but it really is not possible to do anything but guess (or, of course, make biased judgements in favour of the more recent players, a choice many make).