I have taught online before and can recommend it. The platforms currently available allow for recordings and decoments to be shared, creating a flexible environment for learning. There is not much difference for the learner. However the teacher will need to have a firm grasp of the available gadgets on the platform which will require some practice. At current US companies and dominating the online tuition market, offering tuition at dirt cheap prices. I assume they outsource their teaching to other countries. I recommend using UK based companies as the teachers will have a better understanding of the system and will be able to provide more for the student. You can try www.topsetacademy.com for some online tutors in Maths, English, 11 plus and EFL.