Write SQL query to solve given problem: Which company name in London city has the most stocked products?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.CompanyName FROM Products AS T1 INNER JOIN Suppliers AS T2 ON T1.SupplierID = T2.SupplierID WHERE T2.City = 'London' ORDER BY T1.UnitsInStock DESC LIMIT 1