You can .....
a) SCART to 1st tv, UHF modulator (if there is one) to 2nd tv.
split SCART output (don't need an expensive gizmo, just the cheap verison from a "pound shop").
c) Split UHF modulator output (if there is one), using UHF aerial 2 way splitter, approx £3 from DIY shops.
d) If more TVs required, use a UHF distribution amp (if no UHF modulater output, you can also get a separate modulator).
(Rolfw would probably add, forget about buying a UHF modulator, just feed the SCART through your existing video recorder).