GulfstreamV....
Any Proficiency Check/Skill TEst in any class/type rating will count towards the renewal of a PPL SEP(L). So you don't have to do an hour with an instructor in a single engine a/c provided you have the twelve hours on SEP types. (including at least 6 hours PIC). However, if the SEP(L) bit has lapsed, then you will have to do a proficiency check with an examiner to renew the class rating. Either way you will have to get it signed up by the examiner. As to your PPL(A) licence running out, you must send some money to the CAA and an application form to renew the actual licence. By the sound of your name you msy have an ATPL? If you do then don't bother renewing your PPL as the ATPL covers it. Just get the class rating renewed (SEPL). Remember, a class/type rating is not licence specific. An SEP(L) on a PPL is the same on an ATPL. Obviously a B737 type rating is specific cause you can only get one with a CPL/ATPL due to Multi Crew etc etc.
Hope this helps.
Ask any further questions if you want