3 Month Xbox Live Gold Membership Card (Xbox One/360) - £7.79 @ CDKeys

Buy lots of these. Turn on auto renewal after each redemption for a free month. Each code is effectively 4 months then. Turn off auto renewal. Repeat. When you have 35 months of gold redeemed ( 9 x 3 months , then auto renewal 8 for 4 months. 8×4 = 32 months. )
Redeem the 9th gold code for 3 more months. You are now on 35 months. Now convert to GPU for 1 month @ 15.99. That's your 36 month max cap Met. 3 years for £79.91 (edited)

If you have an active GPU sub then this will convert to 50 days

Or you can have GPU free every month for 10,500 MS points which is a doddle to do doing daily browsing in breaks at work and via Xbox app.
Both of those methods net around 18k MS per month and for those lazy fookers out there - research how to browse super quickly on phone or PC - my fave method, copy and paste first million of pi digits and then delete a digit and press enter for valid web search.
This way you will never ever run out of GPU but I am using MS points to buy another xbox one x so will try to find super cheap codes £2 or less per month of GPU using VPN’s and stuff … (edited)

same for me which is disapointing

Yes, a year of Gold I think retails for £40 - so this is a good deal.

Be aware though that Microsoft has very recently publicly scrapped the £1 upgrade promotion for Game Pass Ultimate.

I’m not sure if this means they’ve scrapped or are very soon going to scrap the 1:1 Gold to Ultimate conversion. I’m sure Googling will lead to many people with this concern.

Best to wait and buy codes when you need them, as otherwise you risk codes being used by someone else in the meantime.

If you GPU already then it's highly unlikely you would of been offered the £1 trial as its really for new customers or long lapsed accounts.

You can buy a cheap GPU code off Ebay etc as long as its not classed as a "trial" other than that just subscribe as normal yes its £10.99 so a bit more expensive but in the grand scheme of things over 3 years its not much.

Once you've done the conversion and have a long time remaining its just a choice to extend rather than wait a long time for it to expire and take the risk that MS will change things by then. Compared with the other expenses in life £5 a month to extend with £12 a month back in Rewards isnt such a bad deal and maybe there'll even be a AAA game released on GP this year.

If you can, sell the codes and buy them again when you need them

Most likely they will get used as this is a common problem

Thanks, Just did the same and used your link. Hope the ebay seller is legit as my 3 years of GPU runs out friday so I wont find out for a couple days when it comes to entering the codes

No vpn needed 🏽

Got to buy two at a time. Its annoying but only way to get more is just checkout after every two purchases.

Wait until it runs out to make use of the 1:1 conversion to GPU. Ideally, you want to buy 36 months of codes to stack too. (edited)