Responsive Home Page
This is the only page linked to responsive.css which contains complete working css for a responsive website.
The other pages only have css needed to illustrate the concepts dealt with by that page.

DNS Incoming Mail routing using both BT, KCOM and Gmail We only have one in house mailserver - mail.caralan.net, and it is based on the BT network. However it is possible to create an alternative route via KCOM to the same mailserver using DNS records. mail2.caralan.net points to the same mailserver via KCOM. Setting the second preference MX record to mail2 will deliver mail if the first preference MX is unavailable. This means that if BT fails incoming mail will still be seamlessly delivered via KCOM to the caralan mailserver. If the mailserver itself fails or both routes fail, then mail is routed to gmail (caralanforms.co.uk) as the third preference. (Tested this setup by sending from Google, protonmail and Microsoft mailservers. All deliver OK to mail2.caralan.net) This setup is intended to prevent loss of mail if the primary WAN (BT) fails. mail2.caralan.net is never used for sending because of all the complexity of DKIM, security certs, etc. If the BT route fails then mail.caralan.net should be properly reassigned to the KCOM network. Spam Filter? Perhaps disabling the primary MX may also be an effective spam filter cos spammers don't seem to bother trying secondary MXs. So disabling the primary MX for a couple of weeks may get you purged from spam lists as a dead address... but outgoing mail deliverability will be imaired for that period.