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That Aventon on eBay, as @The.Gren has pointed out, is not particularly exciting and nor will it be particularly zippy. It will work as a bike but you can do far better for £450...
I'd suggest putting up a detailed ad on the Wanted section of LFGSS Classifieds. Include the frame size you're after and your height for good measure. Specify vintage or modern, or just see what is offered.
Seen this on ebay - its in my size and Im seeing it at the weekend but was wondering what more knowledgable people thought
https://www.ebay.co.uk/itm/353628859469?hash=item5255ec2c4d:g:r-MAAOSwJpphG6~r