They should be extending these subscriptions by the number of days given as free access to others. Occasionally they have suggested that they have given world subs as a bonus but what good is that if you don't need them.
They (findmypast) say
"Britain Subscribers will be able to access all World Subscriber Records (except for Excluded Records) during the Free Weekend."
So you are getting a free weekend yourself. Whether you want it or not. I don't need a free findmypast weekend, I can get hours of it everyday at my local libraries.
The point is that the free weekend is in findmypast's terms and conditions
"We may, from time to time, offer a weekend period of free access to Records on the Site (Free Weekend)."
In other words, if you don't like the free weekends you shouldn't complain, you shouldn't sign up with findmypast!
John