Gents, thanks a lot for your comments.
to answer parkfell, when I took my PPL I was not really thinking about continuing up to a CPL so I started flying where it was affordable.
My doubts come from the fact that when I submitted my logbook to obtain the PPL, my CAA contacted the airfield where I did most of my training to confirm some of the flights.
The flights I mentioned initially were done at a privately owned airstrip where there is no such a thing like a controller or a radio operator or any local tech log where take offs and landings are recorded. I can ask the aircraft owner to provide me a declaration with a copy of the a/c book and I hope that would be enough.
I am not a "Parker pilot" and I have no intentions to have legal issues of any kind...
@ Chickenhouse: I had exactly your same understanding until I was informed that the license office had contacted the airport to make a x-check. I tend to believe that something went wrong in the past and now they do spot checks.