Just for you Goblin, from blog.oxforddictionaries.com/2011/11/grammar-myths-prepositions/
This is the sort of English up with which I will not put!
Although Ben Zimmer seems to have laid to rest the myth that the above witticism can be attributed to Winston Churchill, the quote illustrates that trying to avoid a stranded preposition could lead you to get your linguistic knickers in a terrible twist.
In fact, there are four main types of situation in which it is more natural to end a sentence or clause with a preposition:
passive structures (she enjoys being fussed over)
relative clauses (they must be convinced of the commitment that they are taking on)
infinitive structures (Tom had no-one to play with)
questions beginning with who, where, what, etc. (what music are you interested in?)
Most attempts to avoid stranding or deferring prepositions in the following examples end up sounding over-formal, awkward, or like Yoda in Star Wars...
To sum up, the deferring of prepositions sounds perfectly natural and is part of standard English. Once you start moving the prepositions to their supposed ‘correct’ positions you find yourself with very stilted or even impossible sentences. Well-established and famous writers over the years, such as George Orwell, Anthony Burgess, and Julian Barnes, have been blithely stranding their prepositions to no ill effect: please feel free to go and end a sentence with a preposition!