It’s not going to happen.
Everyone would love no speed limit and unlimited data, but they’re going to have to keep hoping.
Hope you enjoy your new network more. You might also wish to consider Smarty. They offer Unlimited for £20 (£18 for a limited time) and they run on Three.
Remember, to keep your number, you need your PAC code. You can get this for free by texting PAC to 65075.