It won't, most likely, have an army with it. These spiders tend to be a little spread out, females set up a web & mostly stay there. They're not great sharers, apart from occasionally hosting wandering males. They do love conservatories (as well as porches, window frames etc.) It's not inconceivable there could be more than one in your conservatory but it's unlikely there are many.
I think it's cute, it's a juvenile Steatoda nobilis, or noble false widow. If it bothers you, tip it outside. I wouldn't be too concerned about individuals that have made their homes, high up out of the way, it's in their interests to stay up & out of the way. They're usually quite shy & bolt for cover if they are threatened.
Also be aware they are capable of living side by side with the smaller, less intimidating Zygiellas (missing sector orb weavers), for which they are often mistaken, so I'd check out pictures of both & learn to tell the difference. Don't now assume that every dark, bulbous bodied, spider you see is a false widow.
Bites are still extremely rare, even where S nobilis are common.