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LOGITECH Combo MK270 Wireless Keyboard & Mouse Set £17.24 / LOGITECH G402 Hyperion Fury Mouse £22.49 @ Currys (Using codes / See OP / Ends Tonight)
These end tonight, so if you're thinking about it, you might want to grab one fairly sharpish. Both good prices at the moment
The G502 isn't quite as cheap as Prime day / previous flash sale, but saw a few missed out on the price, this is only a little more .
MK270 Keyboard & Mouse Bundle £17.24 Use code - LOGITECH25A

LOGITECH G402 Hyperion Fury FPS Optical Gaming Mouse £22.49 using code GAMING25A

The G502 isn't quite as cheap as Prime day / previous flash sale, but saw a few missed out on the price, this is only a little more .
MK270 Keyboard & Mouse Bundle £17.24 Use code - LOGITECH25A

LOGITECH G402 Hyperion Fury FPS Optical Gaming Mouse £22.49 using code GAMING25A

Also the code works fine on the Curry's site but they are running the same promotion on PC world (same company), however when I tried to order it the site rejected the code stating not valid, just a heads up for anyone getting errors with PC world site
If it makes you feel better, that mouse is rubbish anyway. Bit of an awkward shape for prolonged use unless you have small hands. Keyboard is decent though.
Logitech use unified recievers for their wireless mice though, so you should be able to pair any Wireless Logitech mouse with your single keyboard dongle.
For home delivery orders enter code LOGITECH25A at checkout. Offer ends 24/07/2017