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Aircraft hand baggage restrictions imposed after an alleged terrorist plot to attack airliners are likely to be eased next week, the BBC has learned.
Larger bags will be allowed on board, and passengers will be able take some liquids through security from Tuesday, the government is set to announce.
The government's transport security division is holding talks with the aviation industry on Monday.
The new measures should take effect next weekend.
According to BBC transport correspondent Tom Symonds the government has been trying to find ways to reduce the impact of the security alert at airports and has carried out a series of tests.
Rules criticised
Larger bags will be allowed along with some liquids - such as toiletries, including toothpaste.
These items may have to be placed in plastic bags so they can be easily examined at security.
Musical instruments will also be allowed on board again, after professional musicians complained the measures were hindering them.
The limits on hand luggage - brought in last month - have been criticised for causing delays to passengers, and for costing airlines and airports.
The current security measures also ban all liquids except medication essential for the flight and baby milk and liquid baby food, which must be tasted by the passenger.
Thousands of flights were cancelled at Heathrow and BAA's other UK airports after the alleged plot was foiled last month.
Under the current restrictions the dimensions of hand luggage must not exceed 45cm x 35cm x 16cm (17.7in x 13.7in x 6.2in approx), including wheels, handles and side pockets.