Actually I don't have a top level domain, it is a .net rather than .co.uk

However, the top 10 results are a mixture of .co.uk and .coms

Do you think.nets have been downgraded?

My site is hosted in the UK. (hosting is what google uses)

I know about having regional links but what I don't understand is how there were sufficient regional links beforehand and not after the change.

And how I rank number one in countries I have no links from at all.

The results are nearly identical in all contries except for myself at number one and another site at about number 6. Everything else is the same.

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