"So, say I wanted to replace the shitty white switches with nice chrome ones what do I need to order?"
If you want to change the lovely, simple white switches with gaudy metal ones:
start by checking if it that outdoor lamp is fed from a socket circuit or a lighting circuit. A lighting circuit is usually on a 6Amp breaker
If it is on a 6A lighting circuit, your "outdoor" lighting switch needs to be a DP isolator. You will probably be offered a 20A one. You might possibly find a 6A one.
All your indoor switches will be light switches, their type will vary. In most cases you can use 2-way switches. Just buy a heap of them. Because you can use a 2-way switch as a 1-way, but you can't use a 1-way switch as a 2-way. Lots of people carry only 2-ways to save stocking the two types of switch.
If you have any lamps operated by three or more switches, you will need some intermediate switches. You will notice the difference when you look at the backs.
Examples here but there will be an electrical wholesaler near you, probably down some back street on the seedy side of town or on an industrial estate. Avoid the cheapest or unbranded accessories. They will want you to know what you want and write a list before you arrive. Prices shown usually exclude VAT.
BTW, if you are very clean in nature, you can use a small paint brush and a hoover hose to clean all the dirt and dust out of those backboxes. Turn off the electricity first. It will avoid dirt falling out when you are decorating, and dust smears occurring round the boxes in use.