Catcher in the rye -
never read this one, but its a classic, so should be on the list
Wuthering Heights
one of my favourites, but read many times before
Hound of the Baskervilles
not my cup of tea
War and Peace
not sure about this 
T.F.H book of tropical fish diseases
Marine diseases are slightly different
Cat World: A Feline Encyclopedia (1997)
I have this sweet book
Catwatching: & Cat Lore (1986)
sounds interesting
Dogwatching (1986) an in-depth study of "man's best friend".
another interesting one
Dogs: The Ultimate Dictionary of over 1000 Dog Breeds (2001) -
nah
Peoplewatching: The Desmond Morris Guide to Body Language (2002)
I have this one somewhere, fasinating
Seeing as you like LOTR, have you never read the hobbit? You'll know it's the same concept.
One of my favourite books and arguably one of the best.
Another suggestion is Band Of Brothers by Stephen E Ambrose. Good if you are into military stories, it is just a book version of the miniseries from HBO & BBC, which I also highly highly recommend.
Loved the series but not sure about the book
Her Fearful Symmetry by Audrey Niffenegger
The Time Traveler's Wife by Audrey Niffenegger
The War Of Don Emanuel's Nether Parts by Louis de Berniéres
The Handmaid's Tale by Margret Atwood
The Philosopher's Apprentice by James Morrow
The God Of Small Things by Arundhati Roy
The Last Unicorn by Peter Beagle
These look interesting, will look them up
Pabloe Escobar by Roberto Escobar - a brothers perspective brilliant
ah the book you mentioned to Nelly
Powder Wars - about Liverpool drug industry
nah, dont think this is me
Cocky - Cyrtis Warren book brilliant
will go look this one up
otherworld series by Kelley Armstrong
will go take a look
Thanks guys, you have been a great help
Seffie x