70% may have identified as Christians, but I suspect that only a small fraction of that number would care about which direction they are buried in. In fact, I'd be surprised if many even *knew* that this was an issue for Christianity - let's face it, most of the Christians in the UK are of the "Well I was baptised, and I'm not one of those atheist types, therefore I'm a Christian" variety, irrespective of whether they have specifically Christian beliefs.
At the end of the day, they say "Anyone can be buried any way round they like, just as they always could be", so I don't see the problem.
And is it currently/previously the case that by default graves were pointing East (as Christianity requires)? If so, why is no one complaining about giving into Christianity's petty requirements?