It might be useful to check your car's MoT has been updated to include the 6 month exemption. To do this use the link below:
https://www.gov.uk/check-mot-history
If your car is not included you can email
[email protected], giving your registration and MoT expiry date
One point that may be of interest; If you decide to put your car on SORN and want to cancel your policy, I have seen some insurers such as AXA waive any cancellation fee.