LONDON (Reuters) - A deal between the buyers of health and beauty group Alliance Boots and the Boots pension scheme is expected to be completed within days, people familiar with the matter said on Wednesday.

Private equity firm Kohlberg Kravis Roberts & Co., whose 11.1 billion pound offer was approved last month, has offered the scheme about 340 million pounds over 10 years plus a 600 million pounds safety package, one source said, and discussions are now focusing on technical aspects.

"It's very easy to say something's worth 600 million pounds and when it comes to it, it's worth 100 million pounds," another source close to the matter said.

"They (the trustees) want to make sure it's as watertight as possible ... If the offer's not as good as it first appeared, they won't go with that."

A meeting between the two parties is taking place on Wednesday, the source added.

Boots' pension showed a surplus of 20 million pounds last year but the trustees have estimated the size of the scheme's deficit on a self-sufficiency basis -- a measure that assumes no further contributions -- to be around 1 billion pounds.

At the end of last month John Watson, the head of Boots' pension trustees, strongly criticised the firm for agreeing to Europe's largest-ever private equity buyout before a deal is reached on pension provisions.

However, at the same meeting, the firm's chairman, Nigel Rudd, said Boots' pension fund was "one of the best run and best funded in the FTSE" and he had assurances from KKR and its partner, Alliance Boots Deputy Chairman Stefano Pessina, that that would continue.

On Wednesday MP Jenny Willott put forward an Early Day Motion in Parliament, saying: "...this House is concerned that the future of the Alliance Boots Pension Scheme has not yet been secured.

"(It) proposes the establishment of an investigation into the powers of pension fund trustees to protect the interests of their members where there is a significant weakening of the financial strength of the employer as a result of its acquisition by a highly leveraged company."