According to CME Daily Bulletin for GBP calls and puts, on 20180111 the maximum open interest for calls has been registered at 1375 and reached 2957. Change in open interest was +215. Given the current forward points value 28.05, FOREX target price would be 1.3722. Maximum open interest for puts has been at 1340 and has made 2921. The FOREX target price is 1.3372.
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.