From Trading Standards
When you buy goods from a trader, such as a shop, market stall, garage, etc, you enter into a contract that is controlled by the Sale of Goods Act 1979 (amended by the Sale & Supply of Goods Act 1994 and the Sale and Supply of Goods to Consumers Regulations 2002).
You don't have any real grounds for complaint if you:
simply changed your mind
When shopping from home you additionally have the right to:
a '7 day cooling off' period during which an order can be cancelled without any reason and a full refund made
Most of these rights ? and particularly the right to cancel ? do not apply to:
contracts for accommodation, transport, catering or leisure services, which are arranged for a specific time or date eg, train, airline or concert tickets, or hotel bookings
So I'm afraid it is totally at the discretion of the company who sold the tickets unless they told your brother at the time of sale that they would refund. From what I can see they don't have to state these terms and conditions at the time of sale, it is basic statutory rights the same as if you buy a dress from a shop then are too ill to attend the wedding means you don;t automatically have the right to a refund.