Yes, it's jolly good. It's got nothing whatsoever to do with Brexit though, nor is it really a vote of confidence in our economy. And much of the value of the 'investment' boils down to a property investment in central London. But it was announced months ago, the 'story' is that they've decided they're going ahead with it despite uncertainty over Brexit - mainly because Brexit doesn't really make any difference to them.
It does (hopefully) mean 3,000 more highly-paid workers and numerous extra support workers though, so that is good news.