Reddit reviews San Francisco 49ers: The Complete History

Here are a few suggestions:

NFL: San Francisco 49ers - 5 Greatest Games: Super Bowl Victories
http://www.amazon.com/gp/product/B0029ZUQ8A/ref=oh_aui_detailpage_o04_s01?ie=UTF8&psc=1

NFL: San Francisco 49ers - The Team of the 80s
http://www.amazon.com/gp/product/B0089BSLFS/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1

San Francisco 49ers: The Complete History
http://www.amazon.com/gp/product/B000FII21G/ref=oh_aui_detailpage_o03_s02?ie=UTF8&psc=1

My copy of this DVD set has the complete game. I'm not sure you'd want to emulate Montana in that game though. I think he threw like 5 picks.

I'm not sure if this would be compatible with UK DVD players, but I'd also recommend this team history set from NFL Films. It's a bit dated (released in '06), but does a great job of covering everything from the team's inception in 1946 through the end of the Steve Mariucci era.

Also, here's a great fan-made highlight video of the 2011 season, Jim Harbaugh's first with the 49ers.