The Working Time Regulations 1998 require employers to give a "rest break" (effectively lunch) of an uninterrupted period of not less than 20 minutes to any employee working more than 6 hours. It does not have to be paid, but it can be (check your contract).
You also should check to your contract to see if the details are specified in there, or otherwise in a collective or workforce agreement made by your all your fellow employees, these could contain information of the terms of when you are to receive the break and the duration (it may be longer than the statutorily required 20 mins)
Not a very generous break in my opinion, but law nevertheless.
The Regulations also set 48 hours as the maximum number of hours an individual can work, but the individual can opt out of this if he chooses.
As to rest periods within the week, you should use the following website and check under daily and weekly rest periods:
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