Please note that starting with the April-2020 calendar month expiries, TTF and NBP options will expire at 13:00 London time. Please see the related SER

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UK NBP Natural Gas Calendar Month Option Contract Specs

Options
Contract Unit 1,000 therms x number of days in the contract month
Minimum Price Fluctuation 0.005 per therm = £1.40 - £1.55
Price Quotation British pence per therm (1 GBP = 100 pence)
Trading Hours Sunday - Friday 5:00 p.m. - 4:00 p.m. (6:00 p.m. - 5:00 p.m. ET) with a 60-minute break each day beginning at 4:00 p.m. (5:00 p.m. ET)
Product Code CME Globex: UKO
CME ClearPort: UKO
Clearing: UKO
Listed Contracts Monthly contracts listed for 36 consecutive months. 
Settlement Procedures Physical - exercises into futures
Termination Of Trading Trading terminates on the 5th last day of the month prior to the contract month. If this is not both a U.S and London business day, trading terminates on the prior U.S. and London business day. If either of those days is also the termination of trading in the underlying futures, trading terminates on the prior U.S and London business day.
Position Limits NYMEX Position Limits
Exchange Rulebook NYMEX 1163
Block Minimum Block Minimum Thresholds
Price Limit Or Circuit Price Limits
Vendor Codes Quote Vendor Symbols Listing
Strike Price Listing Procedures Strike Price Listing and Exercise Procedures Table
Exercise Style European
Settlement Method Deliverable
Underlying UK NBP Natural Gas Calendar Month Futures