I am running a special offer on all future long distance bookings made by telephone on 023 9237 2180 before midnight on 29th February 2020. You may book as far ahead as you like.
You will get the maximum discount, which is normally only available to customers booking 20 weeks or more ahead.
You will need to quote CODE ITMHP.
Examples of the lowest fares from the Portsmouth area are shown in my long distance fares blog below.