Between 2009 and 2012 the number of tech and digital companies in London increased by 76%, growing from 49,969 to 88,215.
27% of all job growth in London comes from the tech/digital sector, employing 582,000 people in London.
More top news
The service was due to start in September but there is no agreement on pay and conditions such as how many night shifts staff will work.
Would you know what to do if you needed help? Here's the official advice from the Foreign Office.
Fans had to register their details on live.adele.com for the advance sales, which started at 9am.