Where can I get a comfortable non-leather office chair for under £60?

It needs to have good back support, arm rests, adjustable height etc. It’ll be in use for 8+ hours a day.
I thought the £ sign would give it away but obviously not. This is for the UK.

I have one similar to this, very comfortable, 3 years old, still feels like new. Mine cost $70. http://www.staples.com/office/supplies/p4_Staples-Task-Chairs-with-Adjustable-Arms_131836_Business_Supplies_2_10051_SC2:CG32:CL142576

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