Write a 500 word technical article on GDPR (Details discussed below)

For grocery businesses – which hold vast amounts of data on customers through online shopping and deliveries, loyalty schemes and even supplementary services offered by the supermarkets, such as mobile and banking – the GDPR is a big change. And that doesn’t even include their new obligations towards the hundreds of thousands of employees in the sector. So, what are the biggest changes businesses need to know about? And what changes might they need to make to ensure compliance? This is a technical, dense topic. So I want to simplify it by pulling out five key changes businesses need to be aware of introduced by the GDPR and set out for each of the following, give (i) the change (ii) the impact (with a practical example) and (iii) advice on how to prepare, in a composite box-style approach, with a 500-word intro setting out what GDPR is, when it comes into force, why it matters to the grocery industry and penalties for failing to comply. The five key issues I've picked are: 1)The need for businesses to proactively protect against cyber security breaches 2) The need for them to provide access to consumer data – how would this work in practise 3)Employee data, including in logistics, deliveries (online/home shopping, company cars and telematics data of lorry/van drivers 4)How it effects data collected on customers via loyalty schemes, data mining, web cookies and use of third parties 5) How you contact customers and what you contact them with (all forms of marketing, including electronic)