[JayG]

If you can get it then I can recommend Sutton's Tomato Powerfood - Amazingon don't have it in stock, and even Sutton's own website suggests it's either not available in the 750g size, or only available in a 500g pack. 

It's a dry product, and I used to make it up into my own liquid concentrate, which was a lot easier than measuring out teaspoonfuls or whatever and getting it to dissolve every time I needed to use it. One pack lasted a few years, so a very economical choice, and it seemed to have a good analysis and work well.

[oldgrunge]

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Hello Oldgunge,

Chempak was taken over some years ago by that almost unmentionable company T & M!

I used to be able to get it from our gardening club, but the cost went up and the supply disappeared so it no longer sold, worse luck!

Cheers!

You can get it freely available on ebay if you still want it :-)
Only trouble is postage costs are a bit prohibitive.