The tributes page invites you to leave a message on on of four Forums, including this one.

I have read outstanding body of work will remain untouched, but I think that is a shame.

His online warbird directory is The ‘go-to’  site for the most accurate and extensive info, and it will be a great shame if it gradually ceases to be a contemporary resource.  I believe it would be a better tribute to Geoff, to continue his legacy, and not just allow it to fade away.