Thankyou all for your responses, some useful information there and mostly what I was wanting to hear!
Pulse 1 - my reason for raising the question about the airframe, was that I had been told that it's not uncommon for delamination of the firewall to occur due to the ingress of oil/fuel, however I can find no other reference to this occuring,"In fact to the contrary all that I've read infers the airframes are robust". But since you mention that you've done a little reglueing, can I ask, was that associated with the firewall? or are you aware of there being any such problems?
Will also look out the Pilot mag!
Thanks ER