There is money in it for UK farmers, and those UK farmers are in East Anglia because that’s where the soil and climate is most suitable, on account of it being a bit like the Netherlands most probably, a fact that you seem to be quite grumpy about. For the same reason we don’t grow sheep in East Anglia, because the soil and climate elsewhere is better suited to sheep.

Houghton Hall is the home of the Marquess of Cholmondeley and hosts significant art exhibitions. I’ve seen Bridget Riley and Damian Hurst there, also an exhibition by a man who carried a grain of sand around for a year then put it somewhere, all in the name of Art. That probably explains why the above picture looks ~tasteful rather than the vast tracts you’re hoping for.

There’s the local hospice event near King’s Lynn that others have mentioned here. I know people who volunteer for it and say it’s non stop herding the public who are trampling willy nilly over the flowers. The thing is, tulips are popular, everyone wants to take photos with tulips, so those who farm tulips are going to cash in on that with cafes and play areas and Instagram what-nots. The chances of you finding an unattended field of tulips you can make merry in are pretty slim.