The last one I'd seen didn't look ready to ride. I'd check with the stores you could get one from to see if they have been maintained. I remember when they got them back in 2015/2016 and if they only had a year or two service plan the bikes might now be unroadworthy.
has anyone used one of these free homebase cargo bikes? where?
http://www.londongreencycles.co.uk/homebase-trials-cargo-bikes/