When it comes to replacing the head on a radiator valve, there are a few things to consider to ensure that you get the right replacement.
First, you'll need to measure the size of the valve stem to determine the size of the replacement head. The valve stem is the metal part that the head attaches to, and it typically has a diameter of either 6mm or 8mm.
You should also check the type of valve you have, as there are two main types: lock shield valves and thermostatic valves. A lock shield valve has a single adjustment for controlling the flow of water to the radiator, while a thermostatic valve has two adjustments, one for controlling the flow of water and one for controlling the temperature.
In your case, it seems you have a thermostatic valve, as you are mentioning it has a temperature control and a plastic head that is faulty.
Once you have determined the size and type of valve you have, you can start looking for replacement heads. Be sure to look for a head that is compatible with your specific valve and has the same size valve stem. You should also check the brand and model of the valve and match it with the replacement head.
It's important to note that Lifestyle 0906 is not a brand or model, it is just a reference number, so it's best to check the valve and the head for more information about the brand and model, and compare it with the replacement head you are looking for.
It's always best to consult with a professional plumber or a supplier to ensure that you select the right replacement head for your valve and that it will fit and work properly.