Students are asking the Prime Minister to stump up £9,000 in tuition fees for his university education.

Oxford University Student Union (OUSU) is sending mock bills to Oxford-educated Labour politicians, including Tony Blair, to show how expensive their education would have been if they had had to pay the higher fees now proposed by the Government.

The bill, also going to selected academics, represents the likely cost to students of an Oxford education from 2006, when universities can increase tuition fees from £1,000 to up to £3,000 a year.

Mr Blair, who attended St John's College, is liable for a bill of £9,000 for his three-year law course.

The 95 recipients of the mock invoices include Oxford East MP Andrew Smith and university vice-chancellor Sir Colin Lucas.

All are supporters of the new charge.

OUSU is recommending they pay the money to the Oxford Bursary Scheme or a college student support fund, to help those from poorer backgrounds.

The university has backed the fees, arguing students should share some of the costs of their education, with bursary support if needed.

Union president Will Straw, who led a demonstration in London against the Government's plans on June 5 said: "Invoicing those who support increased fees is a striking way of illustrating the true nature of the policy they either explicitly or tacitly support.

"We hope that causing these dons and MPs to reflect on the Government's policy in light of their own experiences will illustrate the effect which the policy will have on students who will be burdened with increasing debt, and on prospective students who may be put off by that prospect."

A university spokesman said: "Congregation (the university's parliament of dons) recently voted in favour of a motion recognising that it is realistic to expect that students, as independent adults at 18 and major beneficiaries of a university education, should bear some of the costs of a high-quality education.

"However, Oxford remains committed to ensuring that no suitably qualified student should be deterred from continuing with their studies for financial reasons.

"This is why the university and colleges have already established the Oxford Bursary Scheme, which this year has provided bursaries of £1,000 each to more than 350 first-year undergraduates."

The student union has consistently opposed fees, arguing they put many students into hardship and deter others from studying at all.

Graduates will be expected to repay their fees at a rate of nine per cent of everything they earn above £15,000.