Ok - let's run a scenario .....
Your Delica is MOTed until December 31st 2020.
You plan to be away from June 10th 2022 until July 1st 2023 (so 12 months 20 days)
MOTs would go like this ....
Get your MOT done in December as normal to give you an MOT until 31st 2021
Next time, instead of waiting until December 2021 for an MOT, you get it done early on July 9th 2021 - makes your next MOT due on July 8th 2022
You then get the next MOT done on June 9th 2022 - so just within the one month remaining that will keep the renewal date of July 8th 2023.
You can now head off on the 10th June 2022 and you will be MOTed until July 8th 2023 - and this will also allow you to keep the Road Tax going so you can return to the UK with a valid MOT and current Road Tax, with the only complication being
Insurance (which I am sure you have in hand and is a different topic).
The dates I made up above gives you a week leeway for a delayed return. You might want to adjust to give yourself some leeway before departure in case of work needed for MOT instead?