Joseph Joseph Multicolored Adjustable Rolling Pin (Amazon Link)
The Great British Baking Show rolling pins have changed over the seasons. In the earlier seasons they utilized a heavy handled sea foam green rolling pin. I've yet to hunt that one down.
In the latter seasons the bakers commonly use two different rolling pins.
The Great British Baking Show adjustable rolling pin is the Joseph Joseph Multicolored Adjustable Rolling Pin (Amazon Link). This is the rolling pin the bakers use to get a uniform thickness of what ever they are rolling out. The disks are removable and allow the bakers to accurately roll out dough 1/16, 1/6, 1/4, and 3/8-inch thick. It comes in the fun multicolored option seen on the show and a blue gradient as well!
Secondly, The Great British Baking Show solid wood rolling pin is the T&G Professional Rolling Pin (Amazon Link). Basically this is a heavy solid Beech rolling pin. Imagine a baseball bat for making food with no handle... The bakers frequently employ this to maim cold butter when making puff pastry and then roll out the pastry.
Lets start with the T&G Professional Rolling Pin (Amazon Link). Holding true to The Great British Baking Show's pattern of using local manufactures when they can T&G Woodware falls right in line. They started in 1975 in Bristol, and to quote their mission they aim to "design, produce and responsibly source, exceptional quality products that withstand the demands of real life."
A solid piece of Beech wood lathed out is going to 'withstand the demands of real life' with ease. Basically, this is about as durable and simple as a rolling pin can get.
Secondly, there is the Joseph Joseph Multicolored Adjustable Rolling Pin (Amazon Link). Joseph and Joseph is a British company started by two brothers 2003. Their products cover a wide breadth of kitchen-wares and they try to do so with an eye towards design.
The Joseph Joseph Multicolored Adjustable Rolling Pin (Amazon Link) is just that. A quality tool backed by quite a bit of innovation. On top of that the rolling pin looks right at home in The Great British Baking Show tent with its fun multi-colored disks.
T&G Professional Rolling Pin (Amazon Link)
French Rolling Pin (17 Inches) (Amazon Link)
A rolling pin is something that you're going to need if you're baking anything that needs to be rolled out. Pressing things out by hand is needlessly tiring and frequently leaves doughy lumps amid over cooked panes.
So which one, or both, is right for you?
Personally I think that the Joseph Joseph Multicolored Adjustable Rolling Pin (Amazon Link) is the bees knees. It's one of those things you see on The Great British Baking Show and think "that is awesome." It is super functional, looks great, and elegantly solves a problem (dough thickness). If you're making pastry or anything else that needs to be uniform in thickness - this is the way to go!
Make sure that you get the Joseph Joseph branded Multicolored Adjustable Rolling Pin (Amazon Link), as Amazon is ripe with knockoffs of this stellar product. And if there is one thing I've learned about knock off versions is that they
smell horrible, break easily, have sharp corners, fall apart, melt, have horrible finishes, flake, taste weird, rattle, wobble are bad.
As for the T&G Professional Rolling Pin (Amazon Link), it is a great option. If you need a second rolling pin (do you?) this may fill that gap. However, you may want to also take a look at French Rolling pins. They're tapered on the ends which just feel nice to work with (it's what I have). Some people also prefer a rolling pin with handles. For example the Fox Run Polished Marble Rolling Pin has the heft you're looking for, a solid rolling surface, and looks great.