Results of an amplitude analysis of the B + → K + π − π + Dalitz plot are presented. The analysis uses a data sample with an integrated luminosity of 210.6 fb −1 , recorded by the BABAR detector at the PEP-II asymmetric B Factory. This sample corresponds to 231.8 million BB pairs. Branching fractions and 90% confidence level upper limits are calculated, averaged over charge conjugate states (B). For those modes that have significant branching fraction measurements CP violating charge asymmetry measurements are also presented (A CP). The results from the nominal fit are summarised here: B(K * 0 (892)π + ; K * 0 (892) → K + π −) = (8.53 ± 0.74 ± 0.46) × 10 −6 B(K * 0 0 (1430)π + ; K * 0 0 (1430) → K + π −) = (34.7 ± 1.8 ± 1.6) × 10 −6 B(ρ 0 (770)K + ; ρ 0 (770) → π + π −) = (5.17 ± 0.80 ± 0.37) × 10 −6 B(f 0 (980)K + ; f 0 (980) → π + π −) = (9.36 ± 0.98 ± 0.47) × 10 −6 B(χ c0 K + ; χ c0 → π + π −) < 2.4 × 10 −6 B(K + π − π + non resonant) < 10.8 × 10 −6 A CP (K * 0 (892)π + ; K * 0 (892) → K + π −) = (5.7 ± 7.7 ± 5.7)% A CP (K * 0 0 (1430)π + ; K * 0 0 (1430) → K + π −) = (−6.5 ± 3.3 ± 2.0)% A CP (ρ 0 (770)K + ; ρ 0 (770) → π + π −) = (32 ± 13 ± 6)% A CP (f 0 (980)K + ; f 0 (980) → π + π −) = (9.3 ± 9.7 ± 2.6)% i Firstly I'd like to thank PPARC for giving me this incredible opportunity, both to work in this amazing field and to experience life in California. I've spent time with a number of great people over the last three years. Many thanks go to each of them for all sorts of reasons: My two supervisors: Nicolo de Groot and Fergus Wilson for all their support, advice and encouragement. The Kππ Krew: Wahid Bhimji, Nicole Chevalier and Huw Shorthouse. For letting me get involved so soon in my PhD and for teaching me so much. Also for the times in the Vaults after a long day fit testing! The UK Dalitz group, especially John Back, Paul Harrison and Sian Morgan. It's a great pleasure to be able to work more closely now with John and Paul at Warwick. Many thanks go to Sian for being an excellent person to work with on this analysis. Despite all the set backs and horrors we made it work! Thank goodness for West Wing and Ravenswood!! My office mates at SLAC: Jamie Boyd and Marc Kelly. For your geniusness in all matters. All the Bristol particle group (who haven't already been mentioned), in particular