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Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: Link

Morden College is a charity which has been providing residential care in Blackheath, south-east London, for over 300 years.
It was founded by philanthropist Sir John Morden in 1695 as a home for 'poor Merchants... and such as have lost their Estates by accidents, dangers and perils of the seas or by any other accidents ways or means in their honest endeavours to get their living by means of Merchandizing.'
Morden College was built (to a design sometimes attributed to Sir Christopher Wren, but largely carried out by Edward Strong, his master mason) on the north-east corner of the Wricklemarsh estate.
Grade I listed. Link
Wikipedia: Link