Suzanne
The Louise Tucker books are good books to have - if only because they simplify everything for the purposes of the ITEC examinations. You will find that many people will complain about the fact that they have simplified complex issues to the point of being misleading. In some cases, that is true, but because the ITEC examiners are using the Louise Tucker books as the basis for examinations, they are the best for passing the examinations.
If you want a good book for massage therapy, I'd recommend Mosby's Fundamentals Of Therapeutic Massage (Mosby's Fundamentals of Therapeutic Massage) by Sandy Fritz. Another possibility is Milady's Theory and Practice of Therapeutic Massage by Mark Beck - although I haven't read this book in detail. Both these books are standard texts for the US massage therapy courses, which are longer and more detailed than the ITEC exams. They do go into a lot more detail, and are very much more extensive in their coverage than Louise Tucker. There are chapters on draping a client - the various possible techniques, etc, how to draw up a therapeutic protocol to treat a client, ethics etc. Doc Clay's book Basic Clinical Massage Therapy is a great book, but one I would say, could wait till after you've passed. It's actually an excellent practitioners guide, with great illustrations showing which muscle is being worked, and it goes waaaaayyyyy beyond ITEC and even some of the 600 hour massage training programs in the US. Warning - these are not cheap! And second warning - remember that ITEC examiners are looking for answers from Louise Tucker, not any other author...
For Aromatherapy, I've used both Louise Tucker (ITEC) and Francesca Gould(VTCT) (which SoniaL recommends) among others in my studies. I like the parts of each - both are good primers. One good book which has a lot in one volume is Salvatore Battaglia's The Complete Guide to Aromatherapy - highly recommeded that to anyone who is starting in Aromatherapy. Again - I can't stress enough - for your ITEC examinations, the answer they are looking for is the one found in Louise Tucker... More so in Aromatherapy than in Massage, you will find that the books differ: in the therapeutic uses of the oils, in the routes of absorbption into the body etc, uses of oils etc
I suppose way I'd advise you to handle these different texts is as follows: use Louise Tucker for the brief overview, read the other texts to flesh out the details, do not get hung up on the differences that you may find, and when you're in your final revision phase: Tucker, Tucker, Tucker.
Then after you've passed, retire the Tucker books to the bookshelves, and move on to the other books.
Remember - ITEC/VTCT etc the paper is the driving licence. The real driving starts after the test....
Good luck in your course, and I do hope you'll enjoy them!