Re: £108k
There's also the culture and work ethic - look at the problems TSMC are having in Texas, where Americans won't work hard enough apparently, yet it's a fact Americans work longer and harder than Brits. Could you imagine how TSMC would cope with the likely workforce in say Grantham, Kilmarnock, or Warrington.
I would bet it's more down to not being able to find local people with the skills which, as the US is not a great chip manufacturer any more, is unsurprising. The solution as always is for employees who do have the skills to work longer.
So if they were to rock up in Grantham there is no amount of employee overtime that could get them out of that pickle.