I am looking to buy a roof window size 114 x 140. My roof tiles are plain tiles, when I looked at the EPW flashings the list did not have an option for the same size?

A roof window size of 114 x 140cm is a STANDARD SIZE 11, as shown in the product selector, along with a flashing size 11 EPV for plain tiles.

The EPW is for use with the side hung range of windows and cannot be used on the FTP Range.