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Our experts suggest spraying with insecticidal soap. Here's a link to an article that will tell you how to make it:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/homemade-soap-spray.htm

It looks as though you've planted it outdoors. Here's a ink that will tell you all about how to care for it: https://www.gardeningknowhow.com/houseplants/flowering-maple/flowering-maple-care-outdoors.htm

If the online climate reports are correct for Bristol, you have a fairly mild climate so you could go ahead and plant it outside now in a sunny position such as south or west facing. The plant can be short lived, however. If weather gets much below freezing there, you may want to wait till spring to plant it outside. Here is more:

https://www.rhs.org.uk/plants/97476/abutilon-kentish-belle/details
https://www.gardeningknowhow.com/houseplants/flowering-maple/flowering-maple-care-outdoors.htm

I suggest pruning it back by a third and giving it some protection from winter weather. Here are some tips:
https://www.gardeningknowhow.com/houseplants/flowering-maple/pruning-a-flowering-maple.htm
https://www.gardeningknowhow.com/houseplants/flowering-maple/flowering-maple-care-outdoors.htm

That will be an Abutilon! Specificallly Abutilon theophrasti. The velvet leaf is considered invasive in some areas. This article will explain more:

https://www.gardeningknowhow.com/plant-problems/weeds/controlling-velvetleaf-plants.htm