Flowering potatoes

I put in some Maris Peer as a second crop at the end of July. They have grown well and look very healthy. I'm a bit concerned as they do not look like flowering. Is this going to be a problem?
At about 750 feet on the western edge of The Pennines. Clay soil.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.