Working from home tax relief

So I'm trying to claim this year's tax relief on Working from Home but the form appears to have changed from previous years. It's now asking me for a figure which states: "You will receive tax relief on the amount you claimed at the rate of tax you paid. For example, you make a claim for expenses of £150 and your rate of tax is 20%, the tax relief would be £30." So if I want to claim the £312 (£6 a week) tax relief do I put in £312 into the box or do I have to put in £1560 (which 20% is £312). Why is this seemingly so obtuse now?

Hi,
You enter the figure of £312 - please see the following Guidance & Links which you may find useful -
Claim tax relief for your job expenses - Working from home.
Thank you.