Merrill Lynch downgraded its intermediate-term rating on Mersey Docks & Harbour Plc to "accumulate" from "buy," while keeping a long-term "acumulate" rating on the stock. "We believe MDK's attractive valuation by itself is not compelling enough to support a dramatic re-rating," Merrill analysts said in a research note. They cut their 12-month price objective on the stock to 620 pence from 665p. – (Reuters)