The cost of upgrading a consumer unit is usually about £500 but it can be more or less depending on the size of the property and the number of circuits in the system.

Generally we advise that you have the first part carried out - called a Periodic Inspection and Test Report - by an NICEIC Approved Contractor, such as Cable Guys. If any defects are identified then these must be rectified before the consumer unit can be changed. The report can be taken to any other electrician so that you can get several quotes for the remedial work and the consumer unit change.

It would normally take about half a day to change a consumer unit, and then test and certify to work.

There are normally two different devices that could trip out in a consumer unit - a breaker (also known as an MCB or Miniature Circuit Breaker) or an RCD (which stands for Residual Circuit Device).

The first thing to do is unplug all items from your plug sockets and try to reset the RCD. If the RCD resets then plug your items in one-by-one until you identify the item that is causing the problem. If you cannot identify the offending item then please call an electrician.

If it is an MCB that is tripping out this is caused by too much current being used on the circuit. Sometimes when a lightbulb goes it can cause an MCB to trip but if you are getting repeated tripping then you will either have a problem with your electrical wiring or with an appliance on the circuit that is tripping out.

If you get repeated tripping of an MCB then it is usually best to contact an electrician to come and check that you don't have a problem with your fixed wiring.

It is possible to distribute 1080p HDTV signal over Cat5, providing a cost-effective solution to HD distribution.

By using devices called "baluns" it is possible to convert the signal at either end of the Cat5 cable to a signal that is usable by LCD/Plasma TV units.

By using a matrix switcher that allows you to route any inputs to any outputs you can enjoy as many HD sources (e.g. Sky HD, bluray player, HD media centre) on as many screens as your budget can accommodate.

When these types of TV first became available there were notable differences between the performance of each - LCD was better at fast-moving programs such as sport and Plasma had better colour-rendition and darker blacks.

Since then both technologies have been improved so that there is very little difference, if any, between the two.

With this in mind it is better to judge each TV on its own merits and ignore whether it is LCD or Plasma.

The old problem of Plasma's needing "re-gassing" is now also something that is no more, with Plasma TVs being as reliable as LCD

There are many products out on the market at the moment that allow you to listen to audio in different rooms from a single system.

The best and easiest use networking, either wired or wireless, to communicate and usually require a central server to hold music files.

One of the best systems is Sonos which uses either wireless or wired networking to communicate between units. The system can be controlled by the Sonos proprietary controller, iPhone, PC or Mac and can distribute audio from a central server, internet streaming radio or standard hi-fi equipment such as a CD player.

Almost all LCD and Plasma TVs are capable of being wall mounted - to find out check in the instruction manual for the TV and see what the manufacturer recommends.

To mount the TV on the wall you will need a wall bracket, which come in many different variations - standard tilt, tilt/twist/turn, slim (no tilt) and more. Cable Guys can provide the correct bracket for your TV subject to your budget and requirements.

To mount most TVs you will need a solid wall constructed from either block or brick for a secure fitting. Small TVs, generally under 21", can be mounted on stud walls (i.e. walls made from a wooden frame with plasterboard) but larger TVs would require significant strengthening of the wall before they could be securely mounted.

Often when wall-mounting a TV you are left with unsightly wires dangling down. Cable Guys can either chase these wires into the wall or provide a discreet decorative trunking solution to hide these wires.