Ceiling Light, RGB LED Dimmable, 18W Ceiling Light, Square, Flush, 100W Equivalent, IP44 Waterproof for any room - £15.36 @ Amazon

EDIT:
Has dropped by another £2.

Installed one of these in our bathroom and it's great, especially if you like to chill out with a glass of bubbly in the bath!

About this item

• Personalize Your Room Light - The multicolour ceiling light can switch to red/blue/green/purple/orange/and warm white color (Warm White can adjust brightness), which choose your favorite color to match your moods, or use it for general illumination with soft white light
• Adjustable Brightness with Remote Control - The color changing bedroom lights support you to turn on/off, dim/brighten, change colors with the included remote controller, adjust brightness from 15% to 100%.
• Ultra Slim Design - Featuring less than 1 inch thicknes and a smooth surface without bulge, this bathroom lighting will attach directly to the ceiling, maximizing the space in your room. Perfect for low ceiling, sloped ceiling where you can not install a chandelier or semi-flush light fixtures
• Reliable Performance- The 18W living room lights ceiling provides a high brightness of 1600lm are not only as bright as 144W incandescent lamp, but also can save more than 85% of power consumption. With the lifespan of 25,000 hours, let you rid of trouble of replacing the bulb and continuously glow for a long time
• Easier Installation - Just 3 steps to complete! Install the kitchen light base under the ceiling, connect wire to junction box, screw the light onto the base, and you are done (All needed screws and junction box were supplied). They are ideal for living room, children's bedroom, dining room, sitting room, bedroom
• Mounting type: monopoint
• Voltage: 230.0 volts