What kit turns a garage into a workshop?

I'm studying vehicle engineering at college and my family has just moved into a house with a proper workshop/garage - which is perfect for bikes. My college friends are starting to ask me to work on their machines. What bits of semi-pro mechanic kit should I look to get?

John Humphreys, Shrewsbury Answered by Chris Dabbs, MCN

If you are starting out on older bikes run on a young rider's budget, dirt and corrosion will be constant companions. So a decent pressure washer and a compressor for air-lines and tools are vital. An angle grinder will be useful as would TIG welding kit tyre levers and a chain breaker.