If you want a local copy of www.blah.co.uk exactly with the same address, for testing purposeses, that's what you do.
Notice that once you do it, you can't access the real www.blah.co.uk on the internet.
One solution is editing the hosts file.
Another is just using www.blah.co.uk or just blah.co.uk, but not the two. So, www.blah.co.uk would be the local address and blah.co.uk would be address on
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