LONDON, Jan 24 (Reuters) - Britain received the highest demand in more than a year at a sale of 30-year government bonds on Tuesday, attracting some 68.4 billion pounds ($84.3 billion) of orders for a new gilt which matures in October 2053 .

The strong demand - which comes after severe bond market turmoil in late September and October - will be welcomed by the government which is likely to need to issue around 300 billion pounds of debt in the upcoming 2023/24 financial year.

The demand also enabled the United Kingdom Debt Management Office to sell 6.0 billion pounds of the new 3.75% 2053 gilts, around 1 billion pounds more than planned.

"This highly successful launch has been possible thanks to significant support from our core investor base whose commitment to the gilt market was manifested in a large and very high quality order book," DMO chief executive Robert Stheeman said.

Domestic investors accounted for around 90% of sales, the DMO said.

Thirty-year gilts are typically bought by British pension funds and life insurers, who are required to hold assets which match their long-term liabilities.

However, these investors - and the liability-driven investment (LDI) funds in which they hold much of their money - were forced into a fire sale of assets after British government bonds suffered record price falls following former prime minister Liz Truss's ill-received tax cutting plans.

The Bank of England had to set up an emergency bond purchase fund to stabilise markets, and only unwound its 19 billion pounds of gilt purchases earlier this month.

Tuesday's bond syndication saw the highest volume of orders since a sale of 10-year "green" bonds in September 2021, which attracted more than 100 billion pounds of orders from investors keen to burnish their environmental credentials.

Since then, a global surge in inflation and higher central bank interest rates have caused bond prices to tumble.

The 3.75% 2053 gilt sold with a yield of 3.7232%, 2.75 basis points more than the 3.75% July 2052 gilt used as a benchmark. This represented a price at the upper end of initial guidance, as usual at British bond syndications.

The 30-year benchmark gilt yield had fallen 8 basis points on the day to 3.633% by 1615 GMT, representing about 2 bps of outperformance versus German and U.S. bonds.

The sale was lead managed by Citi, Deutsche Bank, Goldman Sachs, NatWest Markets and Santander. ($1 = 0.8118 pounds) (Reporting by David Milliken. Editing by Jane Merriman)