According to CME Daily Bulletin for GBP calls and puts, on 20171025 the maximum open interest for calls has been registered at 1355 and reached 788. Change in open interest was +118. Given the current forward points value 18.65, FOREX target price would be 1.35314. Maximum open interest for puts has been at 1315 and has made 2629. The FOREX target price is 1.31314.
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.