Wikipedia founder Jimmy Wales said: "I think that's one of the biggest dangers is the impact on the start-up ecosystem in Shoreditch. If we want to host the next Facebook we want those young companies 100 per cent focused on making a great product that people enjoy.
"Paying them to deviate from their normal task in order to comply with complex security regulations; it's just going to kill it.
"Certainly we already know that there is a brain drain to Silicon Valley. Loads of young entrepreneurs will go there. The harder we make it for people to do business here the easier we make it for the US to get all our best talent."
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Friday will be largely dry with a mixture of cloud and some sunny spells, the best of these in the morning.
Thousands of cancer patients are dying in hospital every year against their wishes, according to a new report.
The Cancer Drugs Fund, which cost £1.27 billion, didn't deliver "meaningful value" to patients - and even put some at risk of side effects.