From the article...
It's a pretty desperate move which shows just how rattled Osborne is getting.
To put it into context, Corporation Tax receipts for 2014/15 were £43 billion. So a move to 15% would shave about £11 billion off that, every year. That's more than all the money the UK will supposedly get back from leaving the EU!
The reason you drop prices is to increase sales not to take less revenue.