National Lottery group Allwyn is set to press the button on a long-delayed technology upgrade this summer that will stop retail terminals from working for 36 hours.

The Czech-based group – which took over the 10-year licence to run the lottery from Camelot in February last year – has warned retailers it will need to carry out the tech switchover “one weekend” over the summer months.

It will mean retail point-of-sale terminals will not be able to take ticket sales for around 36 hours.

It is believed that Allwyn is looking to minimise disruption by timing the upgrade to start at around 11pm on a Saturday night, with the National Lottery not trading overnight and no draw-based games on a Sunday.

While the date has not been revealed, Allwyn’s UK chief executive Andria Vidler has told re

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