I've bought a few more robot kits for A.s.a. H.* That way I shouldn't have to teardown old robots every time I want to build something different. Some of the oldest (hardware and software) must be retired, of course. (Some of which is quite old.** See my blog of 25 March 2019.)
* Including several making use of the BBC micro:bit.
** For example BASIC stamp and RCX hardware and A.s.a. F. software.