Yes...this is a Lavatera. I have one exactly like it and it has become very large and beautiful. Everyone that walks by my house makes a nice compliment about it. I can't remember what the name of it is, sorry.
Golddog, they are closely related and easy to confuse which is why I'm never very adamant that plants like these are exactly what I've posted. Size and colours are very difficult to determine on a photograph, I was caught out by that on another thread sometime ago! The flowers looked large, but it was a close up shot LOL. Took nearly a month before the genus was identified and the poster armed with the genus name then managed to identify the species herself.
Lenjo, I use a number of sources for identification. The very best I find is the RHS or AHS (the book is the same with perhaps a few differences for the climates etc) Encyclopedia of Garden Plants. It's a massive tome and full of plants, descriptions and pics. However, with 15,000 plants to sort through it's not the easiest to use for identification and it's a touch expensive at close on 80USD for a new one. Some other people may come up with a few ideas of good sources but it's difficult for me to say because I'm in another country.