Where possible I would recommend changing the Plugs over to Swiss types.

This is not always possible though, i.e. some transformers that are moulded into the plug. For this I've used an English extension socket that I've put on a cable with a Swiss plug (i.e. used an old Computer power cable and changed the socket end). If you have lots of such devices then a multi-way English extension can be handy (if they will be located in the same place).

Generally:
Blue is Neutral - N
Live is Brown or Black (maybe red) - L

With AC power it should not matter to most devices if they are wired incorrectly, i.e. lights etc.. but for safety it's best to get it right. Also if a device is 'switched, then only the LIVE cable is normally switched, so if wired wrong it could still be 'live' when you think it is off.

Modern electrical systems, including RCD's and trip switches make having a fuse in each device redundent.