  We analyse the possible presence of New Physics (NP) in the Flavour Sector
and evaluate its potential for solving the tension between the experimental
values of $\AJPKs$ and $\BTNu$ with respect to the Standard Model (SM)
expectations. Updated model independent analyses, where NP contributions are
allowed in Bd - anti-Bd and Bs - anti-Bs transitions, suggest the need of New
Physics in the $bd$ sector. A detailed analysis of recent Flavour data is then
presented in the framework of a simple extension of the SM, where a $Q=2/3$
vector-like isosinglet quark is added to the spectrum of the SM. Special
emphasis is given to the implications of this model for correlations among
various measurable quantities. We include constraints from all the relevant
quark flavour sectors and give precise predictions for selected rare processes.
We find important deviations from the SM in observables in the $bd$ sector like
the semileptonic asymmetry $\asld$, $B_{d}^{0}\to \mu ^{+}\mu ^{-}$ and
$A^s_{SL}-A^d_{SL}$. Other potential places where NP can show up include
$A_{J/\Psi\Phi}$, $\gamma$, $K_{L}^{0}\to \pi^{0}\nu \bar{\nu}$, $t\to Zq$ and
$D^{0}\to \mu ^{+}\mu ^{-}$ among others. The experimental data favours in this
model the existence of an up vector-like quark with a mass below $600(1000)$
GeV at $1(2)$ $\sigma $.
