Seems a bit high, but it is also not an "EASY" replacement, I would look around at another Authorized Apple Service store and compare.
Here in the US, I had the battery replaced in August of 2020 on my MacBook Pro (Retina, 15-inch, Late 2013) and the cost was $350 done at my local Authorized Apple Service Store here in Anchorage.
With that, I also got a new "top" (keyboard, track pad)
10/08/2020 - New Battery Installed - $350.00 - top case replaced as well
Product Code 661-8311 Encl, Top Case, w/Batt, 15"MBP Retina -
If you watch the video "How-to" on the OWC site you will see the detail and skill level needed to install the battery on your machine and can decide if you might want to tackle it yourself. - https://eshop.macsales.com
I found it to be money well spent on the MacBook and am continuing to use it as a secondary machine in my new "Covid-19" Home Office.