iPhone XS / Virgin Media / Safari

Every time I visit SHA at home (on Virgin) I get the following pop up:

Dear Virgin Media Customer,

You have been selected for chance to get rewards:
- Apple iPhone XS
- Samsung Galaxy S9
- £200 ALDI Gift Card

Attention, number of rewards are limited.

Press OK to continue!

IP : **********

I don’t get anything else like this on any other site, ever.

I’ve blanked the IP and PIN number from the message.