Tomato feed

I think it refers to the n-p-k ratio specially developed for tomatoes...probably higher in phosphorus and potassium.
green plants usually need higher nitrogen..but fruiting plants (or heavy blooming ones like clematis) require more of the latter two...

Basically tomato feed is just about good enough to feed anything and every thing – I have used for years on every thing and every thing is doing fine

Me too Ken , Alan Titchmarsh recommended this approach years ago , unless you have something truly exotic and fussy
will suit most things as you said.Sold as liquid tomato feed all suppliers should provide it.