Test one thing at a time. It feels slower and it is the only way to learn anything.

An inconclusive account is useful if it stops the next person mistaking a story for a controlled comparison. Not on LL-37 but the pattern is familiar.

Three month limits are cumulative across parcels in more places than people realise.

Ask for the longer appointment slot. Ten minutes is not enough for a complex history and pretending otherwise wastes both your time.

Bring a list. Embarrassment makes everyone forget things, including you.