Archaeologists have made a boozy discovery in Oxford's historic High Street.

Experts carrying out preparatory work ahead of another set of major roadworks on the ancient road have discovered a stone drain that can be dated to the 18th century.

The well-preserved drain ran into a massive stone-lined chamber which may originally have funnelled surface water into the River Thames at Magdalen Bridge.

Approximate dating was helped by the discovery of a glass disc seal from a wine bottle or decanter near the drain.

The seal, embossed with Mag Coll (Magdalen College), is clearly marked with the date 1763.

As wine was sold by the measure, regular customers like the colleges had their own bottles.

County archaeologist Paul Smith said: "Perhaps the college students treated the 18th century highway drainage engineers to a friendly lunchtime drink, or perhaps it could have been broken during a boisterous May Day celebration.

"This is another hidden piece of town and gown history that thousands of people drive over every year.

"It certainly vindicates our requirement for archaeological work on this scheme."

This week, funding was allocated for the fourth successive year of work to repair and enhance the street.

Repairs to St Aldate's between Carfax and Speedwell Street are also planned and likely to take place in 2008.

Other high-profile road schemes planned for the next financial year include finishing repairs to the A420 Shrivenham Bypass this summer.

The council has also set aside £300,000 for cleaning and decluttering road signs.