Date ideas during this time were nothing like going out for drinks or seeing a movie - entertainment culture didn't become popular until later on, in the 1920s, so prior to that, the couple spent a whole lot of time together just enjoying each other's company. Typical UK date ideas for a Victorian couple would've included things like taking a walk through town, dining at a family home, or having a simple conversation while sitting out in the yard or in the parlour. These may sound like boring date ideas to us, but back then, that's what people did. There was no such thing as TV, obviously, and moving pictures hadn't been invented yet, so it really was about spending time together and getting to know one another in a quiet setting.
Once entertainment culture exploded onto the scene in the 1920s, dating and date ideas took a new turn. Suddenly, there were all kinds of venues you could go to with a date, and it helped immensely that attitudes toward dating changed around this time as well. People were still courting, but women were starting to gain independence and making more decisions for themselves, which lead to the edging out of the courting era. Men started asking women out directly, without getting permission from their fathers or families, and women had their pick of who they wanted to go out with. During this time, it wasn't just date ideas and dating in general that was changing, but society was too.
Once the 1960s arrived, and all of the immense social changes that came with it, dating once again changed completely. It evolved into what we know now as the dating world, which includes casual sex, multiple partners, dating multiple people, and generally going out and doing things together for date ideas. Women would go out with whoever they wanted, and men would too - this includes same-sex relationships, which had to be kept totally secret prior to the 60s. We can thank the evolution of dating to the changing times of the 1960s and 70s for how we know dating today, and while there will always be new UK date spots to check out, the idea behind taking someone there will be the same. You're out to have fun together, and see how to get along, without the pressure of having to marry this person.