The recipe itself is likely to be a bit less sweet, and my ingredients (purchased in Denmark) are also closer to those sold in Britain than the American versions. Things like types of cream, lack of sugar added to slightly-processed ingredients etc.
But now I see Germany changed the definition at some point, and a 15mL spoon is an Alter Esslöffel, with a Moderner Esslöffel being 7.5mL. Can a German confirm this, or clarify which is used in practise?
The other European countries I've checked use 15mL (if they use the measure at all).
https://de.wikipedia.org/wiki/Essbesteck#Verwendung_als_Ma.C...
So basically TL and EL are not for measurement but used anyway. Things get funny with a "gestrichener" (flat filled spoon) and "gehäufter" (as much as you can fit onto a spoon imho) Löffel.
I know this stuff is obvious to an experienced cook, but I can also imagine seeing 14,2g of anything causing some unnecessary distress when trying to work with an unfamiliar recipe.
Maybe something like "1c of flour (approx. 120g)" is a good way to be safe?
If you're looking for an engine for actually doing the conversions, there's GNU units[1] and Frink[2] which both contain databases of these conversions you may be able to mine.
Recipe websites don't include that first 10 pages of a "beginner" recipe book, which usually describes how to measure ingredients and the various cooking techniques used.
¹ 1.5 metric tablespoons, 1.5 × 15mL.