Council bosses have admitted it will be 'some time' before they get to the root of the problem which caused the roof at Norwich Bus Station to leak.

The �5m bus station opened seven years ago and was hailed as a state-of-the-art landmark for the city.

But in June water poured through the futuristic-style roof into the main building containing the ticket office, cafe and toilets.

Norfolk County Council had to get its contractors to replace the flexible roof with a corrugated steel sheet so the building could re-open.

But exactly what the problem with the flexible roof was - and who will have to pay for a long-term solution - remains unclear.

A county council spokesman said: 'We are really pleased customers can enjoy the use of the facilities in the bus station building again, but it is likely to be some time before we are clear about what went wrong and reach agreement on how the cost should be met.

'With autumn approaching, our priority now is to find a long term solution, and we are actively investigating the options.'

Tracy Jessop, assistant director travel and transport at Norfolk County Council, previously said the council would look at whether there was scope for the cost of repairs to be covered by warranty or insurance.

The ticket office building had to shut for more than a month because of the leaky roof and the whole bus station had to close for a day to enable the short-term repairs to be carried out.

Ms Jessop had also warned there was likely to be further disruption when permanent repairs are done in the future.

The bus station was designed by NPS Property Consultants, an arms length company of the county council, with Bluestone the principal contractor.