According to CME Daily Bulletin for GBP calls and puts, on 20170809 the maximum open interest for calls has been registered at 1305 and reached 495. Change in open interest was +176. Given the current forward points value 15.15, FOREX target price would be 1.30349. Maximum open interest for puts has been at 1285 and has made 599. The FOREX target price is 1.28349.
See how to use Daily Option Expiry Levels at http://zentrade.online/use-daily-option-expiry-levels/.
Alternatively, find below distribution according to combined maximum volume and open interest.