Everyone visiting the Household Recycling Centres are required to pre-book their visit. This is to minimise queues and congestion on site and to help keep everybody safe.
There is lots of advice out there on how to mend a bike safely. Halfords have lots of how to guides on various things from replacing the chain to general bike maintenance.
What to do with your bike when you are looking to get rid of it?
If you have outgrown your bike or no longer use it, donate it to a reuse organisation such as Gloucestershire bike project,The access bike project in Stroud or the Cyclists fighting cancer The charity bike shop, Cheltenham . If you are in the market for a new bike, why not try them first as a way of supporting a local charity and also giving a bike a second lease of life.
There are also lots of buying and selling websites you could use such as Facebook marketplace / Freegle / Freecycle / Gumtree / Ebay etc.