Retail giant The John Lewis Partnership has been hit by a shortage of gift vouchers after the printing firm it used collapsed into administration, the group has confirmed.

Some stores are understood to have seen sales come under pressure after the group was forced to rely on reserves of vouchers when security print firm BemroseBooth called in administrators in June, according to a report in Retail Week magazine.

The blow came at a key time for voucher sales, during the summer wedding gift season.

One Waitrose employee reportedly wrote to the group's in-house magazine The Chronicle complaining that their store had run out of vouchers:

"Our branch can sell up to £1,500-plus in gift vouchers a week, but we have none. So not only are our sales affected, but so is our bonus, which is beyond our control," the employee said.

John Lewis said it had experienced "difficulties" with its supply of gift vouchers.

But it said the situation had been mitigated in its department stores through the use of vouchers held in stock.

A spokeswoman confirmed that none of the John Lewis department stores had completely run out of vouchers, but Waitrose has had to switch stock of vouchers between stores due to the supply crisis.

John Lewis separately released weekly trading figures on Friday showing that sales rose 12.2% to £57.8 million across department stores in the week to August 28, while Waitrose saw a 6.8% increase.

The pace of growth within Waitrose has slowed in recent weeks, down from 7.8% the previous week and 11.1% in July, although supermarkets across the sector have been impacted by falling food price inflation in recent months.