Depends on whether the /48 is PI (provider-independent) or PA (provider-aggregable). In the case above (LIR gets /29 and splits it to /48s) it is PA, so the /48

Depends on whether the /48 is PI (provider-independent) or PA (provider-aggregable). In the case above (LIR gets /29 and splits it to /48s) it is PA, so the /48 is just a part of the provider's address range, you cannot keep it if the provider ceased to be LIR (or if you wanted to change providers). But you can instead request /48 PI range in 'sponsoring LIR' mode, which would be independent allocation from RIPE (and subject to small yearly fee), just processed by the LIR. Then you could keep it if you change LIRs.