It was absolutely not intended to be a replica of Big Ben! That is simply a nickname that has been given to the clock over the years.
The real Big Ben (officially "Elizabeth Tower") was completed in 1858, making it around 200 years later in history than the time period Banbury Cross was originally set in.
No matter what Gasparich wants you to believe, Banbury Cross was never supposed to represent London or the entire country of England. In fact, Banbury Cross is a real place located about 60 miles from London. When BGW was built they put a great deal of consideration into absolute geographical and historical accuracy, with heavy attention to detail. Just like there is no Eiffel Tower in Aquitaine, there is no Big Ben in Banbury Cross.
Finally, except for the obvious fact it's an English clock tower, Big Ben and the Banbury Cross clock have nothing in common.
Here is an image of the real Big Ben, and as you can see there is almost nothing in common. For one thing, the Banbury Cross clock is
way smaller than Big Ben. And obviously it is constructed of completely different materials. Even their purposes are different. Just looking at the two clocks should make it clear that they are not meant to be the same, especially considering how much pride BGW took in attention to detail.
So no, the clock tower in Banbury Cross was never constructed to be a replica of Big Ben. It seems most people automatically link English clock towers with Big Ben, and that sure is an easy nickname to give it. Really, though, it's not
supposed to be a prop begging for a London theme. It's really a misunderstood, underlying, maybe even forgotten... reference to the Old Country.