The driver of the bin lorry that killed six people in Glasgow in December says he thinks of the victims "every minute of every day".

Harry Clarke says he fell unconscious in the vehicle and does not remember it losing control on a busy shopping street.

He has told Scotland's Daily Record he is having heart tests, but had no health problems before the accident.

"I understand a lot of people want to know what happened that day. I wish I could tell you but I can't," he told the Daily Record.

"I just want all of the families of the injured and deceased to know I can't remember anything. I wish I could but I was unconscious.

"I have racked my brain to try to remember but I can't. I will never know what happened other than people telling me what they saw."

Among those killed in the crash were 18-year-old Erin McQuade and her grandparents, Jack and Lorraine Sweeney.

Stephenie Tait, 29, Jacqueline Morton, 51, and Gillian Ewing, 52, also died when the truck mounted the pavement and drove for up to 300 yards before crashing into a hotel.

Mr Clarke was diagnosed with a heart condition after the crash and has been undergoing hospital tests, but said he previously had no idea he was in poor health.

He also said he regretted not speaking out before.

"I don't want the families to think I have been hiding," he told the Daily Record. "I am anxious that I don't upset anyone but I feel I need to speak out today."

The former bus driver, who has received thousands of messages of support from the public, added: "Nothing will ever be normal for the families or me ever again. I think of everyone every minute of every day.

"I grieve for everyone involved in the accident. Every day is a struggle," he added.

Police have finished their investigation into the incident and the Crown Office is now deciding whether any inquiry or criminal charges should be brought.