I'm not sure why the fees aren't coming up in English. I am in the Manchester and live right next to a post office. I am happy to take in your returns and send them back to Amazon, i'm thinking £3.50 per parcel possibly? I have no idea how many parcels there are, price could always be negotiated. I assume the postage is already paid?
I work from home running a small business and I post out a lot, securely and never have any problems. I have loads of bubble wrap, strong tape and packaging peanuts lying around so everything would be packaged well.
Many thanks,
Zara