Moving on to bigger horsse?

I am currently riding a 14.2 . I love her to bits she is a lovely tb x I would idealy love a 15.2 ish as i am growing out of her. I love to jump and big in pony club, complete locally and a few county shows but nothing huge, does anyone no of anything on loan or for sale? Will be a good loving home, with 3 other horses and a loving family for horses.