AVAST Secure line VPN

Not sure if anyone can assist but since i have added the secure vpn element i keep getting on certain sites the below error

Access Denied

You don’t have permission to access “http://www.argos.co.uk/” on this server.
Reference #18.4a9a7a5c.1512370555.16eb7b8c

But if i turn Secure vpn off i am able to access the site above.

Im set as UK

Any one have any ideas…

Many thanks

This website may blocks VPN services and you’ll not be able to access it.