Thanks pgkevet. We tried one of the Blenheims today and although it's not ripe, it was delicious and perfect for eating. As officially they have another 4-5 weeks to go before they're ripe, we have decided to eat them fresh from the tree, then whenever we see the first wasp hole or bird peck we will pick the rest and store them. Once the cookers start to fall, we'll pick the rest to store. The other varieties don't look at all ripe yet.
Until last year, I used to store apples in the freezer as you recommend, but I found I never got round to using them. This means I still have some from previous years. We have a proper apple store and, as long as we can eat them by the new year, they will store fine in there. Now I know they don't have to be fully ripe, I am more confident we won't lose them to the wildlife. Thank you.