Mr German welcomed an 'independent view'

The board's decision was unanimous - the managers of the WJEC's European unit which was headed by Mike German will be investigated by the EU's anti-fraud unit Olaf.

They also decided that allegations surrounding Mr German's use of exam board credit card and trips abroad will be referred to the police.

"We will also be asking our legal advisers to look at Mr German's statements to the BBC that somehow evidence had been tampered with or falsified," said WJEC Chairman Jeff Jones.

"We think that's a very serious allegation which we are prepared to refute at the highest level."

Mr German - representing the assembly at a meeting in Brussels - said he welcomed the involvement by the police and Olaf, claiming that an independent view was needed.

WJEC Chairman Jeff Jones refutes allegations

"I'm very pleased that at last we are getting something independent into this process," he said.

"I'm sure when the police have looked at it they will realise there's nothing to this and there will be no investigation to be made.

"I've made it absolutely clear that I've got nothing to hide.

"All the questions will be answered and any questions that remain to be answered, I can answer those as well."

Over the weekend the Liberal Democrats have been floating the idea that a judicial inquiry could be held into the whole affair.

Labour would not be drawn on whether or not this was being discussed.

Plaid claim the notes were written by a senior aid

But on Monday, Plaid Cymru were claiming that documents which they say are handwritten by a senior Labour adviser, show that members of the coalition administration, have been actively considering this course of action.

"They clearly show that the objective of calling for that judicial inquiry, was to protect the Liberal Democrats during the general election campaign," said Plaid Cymru Business Manager Jocelyn Davies AM.

In the meantime, the WJEC's board of directors are preparing a copy of the report to send to South Wales Police.

Officers will then have to decide whether or not to investigate the allegations.

And if they did, there would be little doubt Mr German would have to resign.