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Here we present a calculation of the temperature-dependent London penetrationdepth, $\lambda(T)$, in Ba$_{1-x}$K$_{x}$Fe$_2$As$_2$ (BKFA) on the basis ofthe electronic band structure [1,2] and momentum-dependent superconducting gap[3] extracted from angle-resolved photoemission spectroscopy (ARPES) data. Theresults are compared to the direct measurements of $\lambda(T)$ by muon spinrotation ($\mu$SR) [4]. The value of $\lambda(T=0)$, calculated with \emph{no}adjustable parameters, equals 270 nm, while the directly measured one is 320nm; the temperature dependence $\lambda(T)$ is also easily reproduced. Suchagreement between the two completely different approaches allows us to concludethat ARPES studies of BKFA are bulk-representative. Our review of the availableexperimental studies of the superconducting gap in the new iron-basedsuperconductors in general allows us to state that all hole-doped of them beartwo nearly isotropic gaps with coupling constants $2\Delta/k_{\rm B}T_{\rmc}=2.5\pm1.5$ and $7\pm2$.

Momentum-resolved superconducting gap in the bulk of Ba$_{1-x}$K$_{x}$Fe$_2$As$_2$ from combined ARPES and $\mu$SR measurements