I faxed my payment details to Howard - do not recommend emailing, even in multiple parts. He is excellent to deal with and his parts/kits are top notch. You have nothing to worry about sending your credit card details to him without a secure money exchange system - I've ordered from him a number of times and never had an issue. You can also send him a Bank Transfer if you don't want to send your credit card details.
He also now has on his site "DO NOT FORWARD CREDIT / DEBIT CARD DETAILS BY E-MAIL. Credit card details will now only be accept by telephone, post or fax"
Hmmm - just realized the original email was from 2011, so I'm a bit behind apparently... :-)