Whilst this information is informative, it is not particularly helpful. The link Jim provided takes me to a channel I had already tried; the Chat. The agent on the chat was unable to help me with my enquiry as, as he put it "we do not have sufficient expertise to help me with my problem".
Hence my desire to escalate the issue. Whilst I could (and will) try their phone support, which only works in office hours, an email address for support would be more convenient to both me and the support team. This is because the support team could prioritise my enquiry, and apply resources to it according to their work-load.
So I believe email support would make an extremely good adjunct to the other channels of support they provide.