The NA48/2 and NA62-$R_K$ experiments at the CERN SPS collected large samples
of charged kaon decays in flight in 2003--07. The data analysis is still
on-going (with over 20 publications produced so far); the recent results from
these experiments are presented. A new upper limit on the rate of a lepton
number violating decay $K^\pm\to\pi^\mp\mu^\pm\mu^\pm$ is reported:
$\mathcal{B} < 8.6\times 10^{-11}$ at 90\% CL. Searches for heavy sterile
neutrino $N_4$ and neutral scalar resonances ($\chi$) in $K^\pm\to\pi\mu\mu$
decays are reported. Upper limits on the products $\mathcal{B}(K^\pm\to\mu^\pm
N_4)\mathcal{B}(N_4\to\pi^\mp\mu^\pm)$ and $\mathcal{B}(K^\pm\to\pi^\pm
\chi)\mathcal{B}(\chi\to\mu^+\mu^-)$ are set in the range $10^{-10}$ to
$10^{-9}$ for resonance lifetimes up to 100~ps. A preliminary measurement of
the electromagnetic transition form factor slope of the $\pi^0$ from
$1.05\times 10^6$ fully reconstructed $\pi^0\to\gamma e^+e^-$ decays is
presented: the obtained result $a = (3.70 \pm 0.53_\text{stat} \pm
0.36_\text{syst})\times 10^{-2}$ represents the first observation of a non-zero
slope in the time-like region of momentum transfer.Comment: Contribution to proceedings of MESON 2016 conference (Krakow, 2-6
June 2016