How to: Replace valve cover gasket Ford Duratec (Focus, Mondeo, S/C Max, Mazda LF, Volvo)

Removing & replacing the valve (rocker) cover, and replacing the gasket, on a Ford Duratec HE engine, aka Mazda LF & Volvo 2.0L. These engines vary in their installations but the cover and gaskets are the same fundamental design.
You will need:
* New gasket, Ford # 1220025 or Mazda LF02-10-230. Amazon links ~ US: amzn.to/2Ep0Y3T | UK: amzn.to/2HLFr6b
* Gasket maker sealant. Permatex featured Amazon links ~ US: amzn.to/2VDmMhO | UK: amzn.to/2YGZXvA
* Deep sockets 8 & 10 mm for the nuts & bolts
* 15 mm deep socket or good crescent spanner for the plastic studs
* Torque wrench suitable for 10 NM
* Brake clean & rags
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