Well done. You're ahead of me by four years. I too did my first solo from White Waltham in 1970 but I used the Aircoupe fleet (G-ATRY) Sadly it met its demise on the Isle of Wight in the eighties.
In November this year it will be 50 years since that flight and I hope to return to Waltham in my Archer and recreate my first solo to the minute. I still have the registration plate from TRY so will carry it on board with me.
Just hope the weather is not going to get in the way.