While I was working on this thing, I thought it might be a good idea to show this other thing... How to modify your coffee table into a desk! Bonus!
You can either try this fellow instructor's solution:http://www.instructables.com/id/Coffee-table-upgrade/
Or you can buy it from:http://www.aliexpress.com/product-gs/388660302-lift-up-coffee-table-mechanism-B01-wholesalers.html
It cost roughly US$70++ (£40) to ship it to UK (They upgraded mine to DHL!), but compared to the cost of getting a new desk and running out of space, I think it is a good deal. The mechanism is actually quite well-made, if you have a heavy coffee table, it is not a problem, it comes with attachable springs to counter the weight.
The no assembly is required, all you need to do is retrofit the support beam with strip wood 20x40mm, I had only a hacksaw and a regular power drill to managed this! Easy-Peasy! (^_^)
See photo for details.