Google Adwords not visible to me

I have been running a number of Google Adwords campaigns for many months and suddenly, I never see any of the ads on my main ISP connection. This has been the case for past 5 days now.

I tried another ISP and i can see it. Also asked other people and they can see it. (in other words, budget, CPC all ok and the campaigns are getting their usual traffic)

Is there some reason I cant see it normally. Does google deliberately stop me seeing it.?

I think your ISP is masking your IP which Google uses to establish which country you are in. If you are in the UK try adding &gl=uk to your query string. You can also see ads targeting other countries like this.