Her website helpfully refers to the song by its Twitter hashtag…

[Video][Website]
[5.00]
Patrick St. Michel: Compared to “Forget,” not nearly big enough.
[4]
Will Adams: The masterful vocal control La Havas flaunted on “Forget” is nowhere to be found here, save for the title, which is awesomely brandished, like a child taunting you on the playground. Everything else is flat. I blame the repetitive lyrics.
[5]
Iain Mew: Just as bright and playful as “Forget,” but without the same heartbreak fuelled edge, this is the least essential of Lianne’s singles to date. It’s still an easy and enjoyable listen, her voice is still wonderful and it does have one bit of greatness. When the percussion stops and she blisses out over ice cream it’s a moment of escapism out of nowhere.
[7]
Jonathan Bogart: The spiky regret of “Forget” and the contained pain of “Lost & Found” had blown me so far away that I couldn’t help being disappointed by the shuffly glibness of “Is Your Love Big Enough?” The video helped to orient me: it’s not a song to a lover, but to a fanbase, which makes the singalong chorus and the showboating sustained notes make sense: they’re her promise that she’ll keep up her end. Still, anyone can make a “for the fans” song.
[6]
Colin Small: When will soulful songsters realize that high amounts of polish are detrimental to the sound of their ethos? I want pain, not practiced vibrato.
[4]
Brad Shoup: If the fact that this is a pop song doesn’t suggest a city milieu strongly enough, they’ve helpfully frontloaded the song with busy-street verité. Get past that and enjoy a Laura Nyro–style blend of playful confrontation and compositional finesse, with multiple La Havases (Havasu?) doing the LaBelle thing. It’s ideas over feels, but as ideas go, 6/4 is more than big enough.
[7]
Pete Baran: She found herself in a second hand guitar. This is clearly important, as Lianne says it twice, before she asks the question in the title. Well bearing in mind that no matter how new a guitar is, to fit inside one you would need to be at most one foot tall, how big a love really would be required? Certainly the amount of love the average chihuahua shows its owner should be enough. Basically not actually that much love should be enough. Which is just as well becasue that about as much love as I can feel for this perky nonsense.
[5]
Anthony Easton: The finger snaps, the ambient noise, the awkward music-as-truth-about-life metaphor, the rhetorical questions, the vague directions about the future, and some notice about dancing, in a song that suggests nothing at all could be danced to. My love is big enough to truly hate this.
[2]