Do I have DNS problems? Slow loading or no access ...

Hi all,
Most of the time my broadband seems to play nicely however I seem to have painfully slow loading or non-loading websites with annoying regularity. It is not all sites and the problem seems rather selective.
Sites that I know are up (such as bbc.co.uk) are sometimes impossible to load. A speed test shows somewhere between 2Mb and 7.5Mb (yeah, I know - contention in my area is a real issue).
If I VPN out to a proxy server then everything works just fine.
Does anyone know if this is a BT DNS issue?
Thanks!

Thanks for the reply.
I changed my DNS to 8.8.8.8 but still no joy - pick a random page and some work, some don't. My smart TV is decidedly dumb and nothing will stream. Give it a few hours and it is usually fine.
I am also randomly getting the message that "You're seeing this page becasue BT parental controls is active and you are attemtping to connect to a DNS outside of our network" which I am not...
[sigh]

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~~~~~~~~~~~~~~~
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