Found a faq regarding sunlight
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Q: How much sunlight does a lotus need to bloom?
A:
A lotus will flower in six hours or more direct sunlight. More sunlight
means more flowering and stronger stems for leaves and flowers. Lower
sunlight duration makes stems weak, allowing leaves to fall over
easily. Flowering is dependent upon adequate fertilization.

So it looks like you can get the seeds to sprout and it will be an
experiment to see if they will bloom in England's summer.
Let us know what happens!

kathy