Lazy Jay got testcards D and E complete by about 2pm, yesterday.

-=-=-

A little bit tricky, given how they used elements from both Testcards C and F, but also tricky because they're actually so darn identical!
Seriously, there's barely anything between them other than a couple of dots near the bottom, and the background of the little gradient bar bits in the middle.

I had to sit there, double checking through all the online versions that I could find, that there weren't supposed to be any more differences than those.
Very unlike the BBC to name an entire testcard after barely any tweaks. By contrast, Testcard F has been through decades of tweaks, fixes and upgrades, but people still refer to it as Testcard F, even today.
Maybe they just like the letter F?

I dunno.
There's a G, though, so. *shrugs*

You can Compare D and E here, and pick your favourite!!! Do you prefer Dotted or Undotted!?

Meanwhile

I then settled down to do some coding in SmileBASIC. But Lazy Jay took over, and couldn't be bothered to head upstairs to grab my keyboard for the Switch, so instead I sat playing Animal Crossing for a good number of hours.

My battery's draining fairly rapidly on the Switch, nowadays. I'm thinking (since it's a Release Day Switch) that it might be time to upgrade, but I think it's probably a good idea to wait until some time around March/April.
It currently seems like Nintendo are planning something Switch related around the end of March. There've been rumours of a possible Switch Pro for quite some time, and then there's the whole "On sale until March 31st 2021" thing that seems to be plaguing a number of recent releases.
It's all very odd. .. So, yeah, I'll wait a bit, and see what's going on.

.. And maybe play a few more hours of Animal Crossing, in-between!