Note the change of destination to Southsea Castle. The castle has a restaurant that sells beer (unless, of course, you prefer the champagne bar). If unsuitable on the day, we'll find a local pub.
About evening pub rides
Thursday evening rides in the summer from Havant. Destination is a pub for a drink or a meal.
There's a good chance you will arrive home after dark so you should bring some lights with you.
This article describes what you should consider bringing with you.