Liquid feed

Always look at the NPK of thee fertiliser, and how much you need to dilute it, many very cheap liquid feeds have lower numbers,for example a bottle marked 10-10-10 , add equal amount of water and it would be 5-5-5

The npk shows the ratio of nitrogen posphorous and potassium

Tomato feed will work, but there may be better depending on what you want the fertilliser to provide, as a general one I often use standard miracle grow or asdas own general feed, dissolve a measure or so in a bucket of water and pour it on

Myself on fruit trees I use the very much cheaper powdered ones with individual components, from someone like chempak , they are much cheaper , you can make them liquid by dissolving them, but i usually just chuck them around fruit trees, sulfate of potash and sulfate of ammonia usualay

Unless you have a known problem though, something like blood fish and bone is better as it is more balanced

Being new trees I would sprinkle with blood fish and bone, then water them a bit not bother with liquid feeds, most of a liquid feed tends to wash out the bottom of a pot, solid ones stay in the pot longer

Thank you I will have a look while I'm out today, I was just thinking I should be feeding my trees but with so much stuff on the market I'm getting a little bit confused.