Hundreds of shoppers using Friars Square carpark were charged too much money following a serious computer glitch.
Drivers had to pay full charges on Good Friday, when the Bank Holiday flat charge of £1 should have been in operation – and now shopping centre bosses have a huge headache over how they are going to reimburse them.
Angry shoppers called the Bucks Herald and contacted Friars Square to complain about the error.
Centre manager Andy Margieson said: “We apologise to anyone affected.
“It was a technical fault. The computer system didn’t pick it up as a Bank Holiday which it obviously was.”
New equipment is being installed on Monday (April 28).
Mr Margieson said: “We had four complaints and in all cases we are sending a free car park ticket for their next visit.
“Obviously more people were affected and we are trying to work out a system today of how to deal with the problem.
“We’ve got to look at a system where people have proof of purchase.
“That could be a car park receipt, or we may have to check their registration number on the CCTV but that is very labour intensive.”
Some shoppers would have benefited from the bug, paying only 90p rather £1 if they stayed less than an hour.
The normal rate at Friars Square is 90p for one hour, £1.60 for two hours, £2.50 for three hours, £3.60 for four hours, £7 for five hours and £10 for a day.
There are around 400 spaces.