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18/26 - a 1-letter abbreviation for Jack and a 2-letter word for appearing inside 5-letter word for books (large, heavy ones)

30a - a Scottish designer and architect who has the same name as your answer but spelt with an additional K that needs to be removed (K is apparently an alternative to Kb, kilobytes of computer memory)

I wasn’t keen on the “k” but Collins supports it.
I prefer it as an an indication of a work by Mozart :-)

And the two-letter word for appearing is not great either, but everyone here seems to agree, so I guess so. I didn't see anything else it could be.

Actually, I'm more comfortable with the "K." I've always used it, as in my first 30a had 512K. True story.

darla @54, for my second real job I worked on an early brain scanner whose computer was the size of a fridge freezer and had _32K_ (32 kilobytes. For operating system and application program.) of 'core' memory - individual little ferrite cores wired together manually! Hard to believe now...

I started programming on a PDP11. It was the size of a dustbin and had 32Kb of memory. It was set up for multi-user access! When I ws doing the exam marks on it, I had to throw everyone else off.

Theme more general this week and helpful, clever doublers (16d 1d, 8d5d, 2d 28d, 18a 26a) and singles. Enjoyed this one

Morning all
Had a good go at this one, finished all bar the parsing of 20 a. and 16 d, hints appreciated

20a is a fairly obvious hidden. So obvious that it was almost my LOI, so I commiserate.

16d is a famous musical. A type of basket with the first and last letters removed. If you don't get it today, there's always ...

AOB

Many thanks , am kicking myself but had 15a wrong so all is now well