Tesco

Tesco shoppers have been left furious after the supermarket announced it will add a £4 charge to all grocery deliveries under £40 later this month. See below for how to beat it.

John Lewis and Carphone Warehouse are among the top names on the high street to haggle with, new research from MoneySavingExpert.com reveals.

Update: 18 May, 2.10pm: Mighty Deals says all customers have now had their redemption email. It hasn't however answered our questions about what went wrong over the weekend.

Mighty Deals admits it incorrectly told more than 1,600 shoppers they couldn't get a £10 Tesco voucher for £5 after it unsubscribed them from its service, which it says it did in error – just days after angering users over the same voucher offer.

Tesco Clubcard customers can double the value of their vouchers from Monday (18 May) to spend on 12 categories online and in-store, including gaming, travel and electricals.

Nationwide credit card customers will no longer be charged for going over their limit from today, while the way it charges interest for those with balance transfer credit cards is also changing. But will other credit card providers follow suit?