Surely you at-least have contacts through the school(s) you used to get your licences.
Then there's what social side exists wherever you fly. Any club nights? Professional pilots fly for fun too, and are as likely as pure PPLs to turn up to such things.
Those two are obvious starting points. Also I believe that most pilots unions (BALPA, etc.) have a "trainee" grade and becoming involved with them can't do any harm. A quick Google shows a trainee grade of BALPA which is free, and a student grade of the IPA for £30pa. Either or both will give opportunities to go and network.