B&Q sell a few different options if you have one nearby? I just bought a pack of three with remote for £19.99 which controls each of the three devices individually, or all as a group. I use mine for three lamps and it works well
The other option is a 'Bye Bye Standby' Intellipanel. These automatically turn on and off, cutting power to all other devices plugged into it. You chose a 'master' device, I use my amp with mine which is plugged into the master socket. You also have a remote control sensor for turning it on that you train to recognise the On/Off signal of this master device.
When you push the On button on you master sockets remote, it powers up the panel and everything plugged into it goes into standby, as if the switch on the wall had just been flicked on. You can then turn things on as normal.
When you turn the master device off, the panel recognises the drop in current and after 30 seconds, turns everything else off, again as if the wall switch has been flicked.
You have an 'always on' socket too, for Sky+ or other PVR's so they still record even when everything else is off.
No extra remotes are needed and it's also an 8-way surge protecting power strip.
Just thought this may be of interest