Yes, some of our lighting products are dimmable. If individual bulbs and fittings are dimmable, it will say so in the product specifications. 240 volt bulbs can simply be replaced with dimmable LEDs of the same type. Standard household dimmer switches should operate the lighting correctly but in a small number of cases the dimmer switch will be incompatible because LED lights use so little energy. If the lighting doesn’t dim correctly or won’t turn off, it is likely your dimmer switch will need to be changed for a type which is compatible with the LED lights. A qualified electrician can do this for you and will supply a Triac leading edge dimmer switch.
If you are replacing lighting which uses 12 volts like the dimmable MR16 GU5.3 bulbs, you may need to upgrade your lighting to use an LED dimmable driver. If the lighting doesn’t dim correctly or won’t turn off, it is likely your transformer will need to be changed for a type which is compatible with dimmable LED lights. A qualified electrician can conduct this work for you.