It's true that at its eastern most extreme, the 13 is a hidden gem, but in order to get to it one must endure the southern section of the route, and all I can say is that having used it for a number of years as my local route, the 13 is not to be used for pleasure! It was an absolutely horrible route, getting stuck along London road, then pausing outside Morrisons for five minutes before going the long way into town, which meant further delays. All the while, you would watch as the 231 and 272 sail past on their quicker route into town. Further more, there's now the chance of an 09 plate e200. In my opinion, not recommended.
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42916 is back in Bath though, so maybe that explains it.