Thanks @Jeffus had a response back from them with the following.
Thank you for your enquiry, your Profile Type is 01.
@Tim_OVO I’m not sure if this helps with any further investigation at your end.
I discovered that if I used the address not found option when requesting a quote, and manually populate my address that I do get a standard single rate tariff but with a switch date a few weeks into May. I went ahead with this on Saturday but I’m not sure if it’ll fail during the switch process if a discrepancy is found.
I’m keen to join as soon as possible to take advantage of Charge Anytime but not sure whether it would now be riskier to try cancelling and going ahead with your suggestion of raising the switch with dual rate, and then contacting support. What would you suggest @Tim_OVO ?