Oaks from acorns
The thing about importing talent is: what do you do with it, once it's here?
It appears that the government has swallowed the idea of a "magic bullet". That if you have a problem ... if nobody else can help ... that all you need is an "A team" and they'll somehow use their "world-leading talent" to sort you out.
Most of the problems that the UK's IT industry have are nothing to do with IT. So bringing in outsiders to give it a boost won't produce the hoped-for results. The fixes that are needed start with better technical education, move on to recognising the worth of people who can wield a soldering iron (at the right end) or spanner or stack trace, and also address the basic issues of expensive cost-of-living, unworthy management, short-sighted investors, an innovation-stifling environment and a reticence to taking risks and recognsing opportunities.
As a country, the UK is quite capable of producing its own top-quality IT people - rather than sucking the talent out of other countries. But it needs to nuture, grow and reward those people. Not just cover them in fertiliser.