Before I even begin this post I want to start by saying, I don't recommend anyone take an unpaid internship...especially when there are paid options available to you. I don't agree with unpaid internships in any way as I feel everyone should be paid for their contribution's.
With that being said, myself, I found in a very difficult position. Trying to get a paid internship in my area of Yorkshire involved with Marketing was little to nothing, and I mean nothing. Even still, I found only a handful of unpaid internships, that were involved with marketing. I should add, I was only looking for a summer internship, not a year long as it didn't fit with what I had planned.