Global gas prices are influenced by what happens in Russia, so if we're dependent on any gas, we're somewhat influenced by Putin. Also, I think it's fair to argue that even 4% is 4% too much!
Wind's variable nature kind of means that one needs to use it in conjunction with natural gas or something similar that can fill in the gaps.
Maybe one could just use geothermal or nuclear, but if one goes with wind, unless one has a lot of hydropower capacity, there's probably also going to be some level of natural gas in the mix.
Wind, nuclear, tidal, solar, geothermal and even biogas if deployed correctly — the combination can get us off fossil gas. I'm pro-nuclear myself, which I think is where Labour is leaning, too.