The twins are taking part in studies by researchers from the Karolinska Institutet in Stockholm.

The scientists are investigating links between the environment and human behaviour.

But participants are viewing the excursion as a form of light relief. As one twin put it, they have come across "just for fun".

As the twins disembarked from their ship, the Tor Scandinavia, each pair was confusingly dressed in matching outfits.

It is hoped the sets of siblings might find something different to wear when they spend their money in the local shops and boutiques.

'Twins cruise'

The visit to Felixstowe is the brainchild of the ship's captain, Sune Dahlstr�m, also a twin.

He claims his inspiration to charter the 'twins cruise' came from an encounter a few years ago with two identical twin sisters riding identical twin horses.

"For me it's very strange indeed to see so many people who are identical - although I'm used to it myself, it's very strange you know," he said.

Aged between 11 and 80 the sets of twins come from all parts of Sweden and most live apart from each other.

But today they are reunited, and looking to spend.

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