Tesco has said it is expanding its home delivery and click & collect capacity to around 780,000 slots this week.
That represents an increase of 120,000 from two weeks ago, with another 100,000 increase planned.
Following a recruitment drive, the store said it's added more than 200 new vans and hired another 2,500 drivers and 5,000 store pickers to help handle increased demand following lockdown.
Earlier this month Tesco announced plans to hire 20,000 new staff to work in its stores for at least the next 12 weeks after "unprecedented" demand from shoppers.
In an effort to keep up with demand the store also said it will limit online customers to an 80 items shop.
Tesco chief executive Dave Lewis said: “We’re doing everything we can to increase the number of slots available and to support vulnerable people.
"Through a series of measures including more drivers, pickers and vans, we’ll expand the number of slots available each week; but this still isn’t enough to meet the demand.
"For this reason it is vital that customers who can come into stores and shop for themselves do so – so we can free up as many slots as possible for vulnerable people."
He added: "We thank our regular home shopping customers for their patience as we do all we can to make this service available to as many people who need it as possible.”
As part of its response to the virus, Tesco will stop selling skimmed milk in its stores as it streamlines what's on offer to make sure it can stock enough of the most in-demand products.
The supermarket will also temporarily axe most of its promotions and multi-pack deals in an effort to stop people panic buying during the coronavirus outbreak.
It means customers will soon only have the choice of semi-skimmed or whole milk - in either two or four pint bottles.
Tesco will also simplify its toilet roll range, with at least one supplier asked to only send nine-roll packs in.
Delivery rule changes are designed to "increase the number of customers we can safely deliver to".
It if customers make a change to an existing online order or place a new order, they'll only be able to order a maximum of 80 items.
An email sent to customers reads: "As you know, we’re currently experiencing a very high demand for our delivery and Click+Collect slots.
"We’re doing everything we can to increase the number of customers we can safely deliver to.
"That’s why we’ll be making some changes."
It added: "We’ll be capping the number of items you can add to your online basket to 80.
"This means that if you make a change to an existing tesco.com order or place a new order, you’ll only be able to order a maximum of 80 items.
"To help give everyone access to the essentials, every product will still be limited to a maximum of 3 per customer.
"To help keep everyone safe, you’ll start to see all of your orders arriving bagged.
"This will also limit the amount of time customers and drivers need to spend on the doorstep. "
Tesco's coronavirus changes so far:
- A store-wide restriction of 3 items per customer on every product line and removed multi-buy promotions
- In product areas where demand is particularly high, Tesco has simplified its range to get more of the most popular products on shelves
- A special hour in stores for NHS workers introduced as a thank you for all they are doing. On Sundays, they can browse large stores and select their shopping an hour before the checkouts open.
- Prioritised one hour every Monday, Wednesday and Friday morning between 9-10am for vulnerable and elderly customers.
- Limited online orders to 80 items or fewer - with products now arriving bagged.
- Closing 24-hour stores overnight to allow re-stocking.
- Where needed limit the flow of people coming into stores to ensure they don’t get too congested
New floor markings at the tills to help customers keep a safe distance from others
Installing protective screens at checkouts
Cleaning stations to wipe your trolley, basket, or Scan as you Shop handset
