TSP does seem to be similar to sugar soap. Range of TSP here:
I use sugar soap for washing down and preparing paintwork before decorating. It's very good at cutting through grease but don't go mad with it on gloss paint, as it can damage the surface.
I've been trying to remember the brand names of soap powders over there, there's no actual biological brand name but manufacturers make products such as Persil Bio and Persil Non-Bio.
If you look down the cheaper end of the soap powders in the supermarket, you might find them there. Do you have Surf or DAZ? The blue coloured soap powders could well be biological. Should say something on the box.
As Susan said, they're for breaking down protein stains, such as egg, blood, etc.
Glad you like the programme, anyway.