Well there are various Sites that list the frequencies and other parameters you'd need, in general terms - BUT, the particular Channels you've mentioned are not actually Free To Air (ie Unencrypted) on Satellite anyway, so your Freesat Box is unable to decode them.
Sorry.
All down to Rights Issues which mean "overspill" outside the UK/RoI must be limited. That really doesn't affect DTT in the same way (unless you live in Ramsgate!). It's quite hard to limit Satellite "Footprints" to satisfy Rights Holders, so Encryption is the easiest way to go.
BBC, ITV et al are grouped together on one particular Satellite that has relatively restricted geographical coverage, so can be sent "in the clear", but capacity is limited.