There will still be tubers, and the large plants don't necessarily mean they will be small or lacking. Usually the problem with 'all foliage and no tubers' comes when potatoes are over-fed. Our potatoes have the largest tops too this year as we've had similar weather in France. I excavated a few tubers yesterday but they are still very small.
Other than earthing up as much as possible, there's nothing we can do, so just keep your fingers crossed.

Thank you Bertiefox for your comments, i will earth up again as you suggest, and as you say "fingers crossed". Thanks again.

Just to update: had another go digging potatoes yesterday and found the tubers were now about twice the size of when I dug them in June.
So probably worth looking at how yours are coming along especially if they are 'earlies'.

Thank you for your update, I have checked as you suggested thinking that I wouldnt find anything, but hey ho I have potatoes, they are quite small but salad size and pure white so they are on the menu tonight, shall I leave the rest for another week or so??

It's a choice of larger and later, or tastier now. I always think the first new potatoes are always the best, especially with a dab of butter and some parsley.