Virus Concerns

You are not worrying too much. You have done the right things so far but you may have to talk to your credit card provider. You have a concern and I believe you're obliged to advise them by the terms and conditions.

Did Tesco actually confirm the order and have you received the goods.

Malware is not involved here.

If you could actually post the full link here (without the "https://" part, so it doesn't get turned into a clickable link), that would help us determine what that site is. It looks like there's a company called Flashtalking that is an ad provider, but I'm not sure whether that is the same "flashtalking" as in your URL. There is also an MII Solutions out there, but not on the .net domain. Their address is miisolution.com. They appear legit, though I have no idea why they would be involved here.

Most likely, there was just a bug in an ad script on the page you reached, and that caused the problem.

Follow Thomas Reed's advice. You are lucky he was looking in at the time.

I don't think you should think so negatively about Tesco. They are a major company; they cannot afford to have internet ordering problems. Pursue their technical department subject to what Thomas helps you discover.

I suppose it is too early to have received the goods (which is after all, the ultimate proof of your order being successful).

Usually if you know what you are looking for, Sophos will dig out what is on your system and you can delete it. Thomas will come back, but it is Sunday and some people have family obligations and are less available then.

I don't know of that particular name, flashtalking, and if Thomas cannot condemn it then it is likely not to be a problem. As a guide, here is a paper he wrote about Malware.

Thomas' Corner : Mac Malware Guide

That site appears to be clean, from what I can tell, as does the origins.flashtalking.com site referred to on that page. None of this is related to malware of any kind.

If you are still concerned and need to set your mind at ease, just do a scan with Sophos. Note that there is absolutely no need to do a clean boot for this purpose on a Mac.

For more on the topic of malware, see my Mac Malware Guide:

http://www.thesafemac.com/mmg

I had the same thing, google shows others who have had the same with Thomas Cook. I think it is an advertising tool, which presumably looks at your browsing history. I guess it's in the terms and conditions, which we usually tick without reading, but it's still annoying.