Data centre cooling is the real problem.
The problem currently, really, is that data centre cooling systems haven't really changed in decades. Yes, the cooling systems have become bigger and some have per-rack chillers but essentially they're still just big refrigerators, wasting electricity cooling recycled air and pumping it inefficiently into the atmosphere.
What is really needed, therefore, is a more intelligent use of the waste heat and a more intelligent way of cooling the servers.
Now, let's look at the UK, for the majority of the year external temperatures are at or below optimum operating temperatures for systems. So, why not use that external air, passed through filters, directly as cooling air and then pass the clean, warmed air out of the data centre and into the offices where it can do some use on a winter's day and save some heating costs? During the summer, assuming it's warmer than this one, then you will need chillers to cool the incoming airflow and possibly some recycling of the internal air could be used, but overall the yearly energy bill would go through the floor.