Given Vernon's extensive experience in public speaking and fundraising, I estimate his hourly rate to be around $75. This is a relatively modest estimate considering his skills, but it's also worth noting that his experience spans over 81 years, which is unusually long. His experience in volunteer management and teaching also suggest a strong work ethic and ability to adapt to new situations. However, his location in Truro, England may also impact his earning potential. To be on the safe side, I've chosen a lower estimate, but it's still a reasonable reflection of his value as a professional.