"Adaptation", software and databases: can you help?

A PhD candidate in IP law at a very highly-regarded academic institution in Germany has written to ask for a little assistance from this weblog's reasders. He explains:

"I am researching a section of UK copyright law and am reaching out ... for some help. The question I am concerned with is about section 21(3)(ab) and (ac) of the Copyright, Designs and Patents Act 1988. These sections give the authors of computer programs and databases the right to make adaptations, and adaptation is defined as an "arrangement, altered version...or a translation".

My question is: how have these words been interpreted in the UK? I am searching for case law on this provision but currently have not found any.

For the record, the relevant part of the provision reads like this:

"(3) In this Part "adaptation" -
..
(ab) in relation to a computer program, means an arrangement or altered version of the program or a translation of it;
(ac) in relation to a database, means an arrangement or altered version of the database or a translation of it; ..."

Offhand, this blogger couldn't think of any British decision, reported or otherwise, in which the meaning of "adaptation" has been discussed in relation to computer programs and databases.  However, he has the uneasy feeling that he may have missed something quite obvious.  Can anyone else help?

What might also be interesting is to hear of anyone who has based their own decision either not to take legal action or not to defend one on the basis of an interpretation or application of those words in this context.  If you have anything you can usefully add, please do so!