As far as I know this legislation is still in the system but no progress as of yet.
UKBA hates the CTA & the issues it causes and the abuses that arise from it.
The potential is that by travelling through Dublin it can be seen by UKBA as a specific attempt to avoid UK Immigration control. Granted that most people use it as a cheaper way to get to where they want to go, but it is the minority that use it for illegal entry to the UK that is causing the problem in the first place.
IMO - avoid travel through Dublin thereby avoiding the potential problems that it could cause in the future. Especially if there is an intention to settle or live/work in the UK down the line as it could be seen as an intentional evasion of UK immigration control.
By asking & using the term that the OP did it makes me very suspicious of the nature of their intentions and I would advise that if they, or the person that they are trying to 'help', have any intention of using this route to enter the UK where they have either been refused entry/visa or would not qualify for entry to the UK, to stop.
For background discussion on this issue can be found here:
http://talk.uk-yankee.com/index.php?topic=58317.0the way i understand with regards to the bill, any bill that was introduced by the previous govt and was not passed before parliament was dissolved ceased to exist on the day parliament was dissolved.
below is the link to the bills currently going throuugh parliament
http://services.parliament.uk/bills/
Granted that may be true however, this is an issue that has long been a problem and was attempted to resolve with the BCI Bill last summer but was removed then readdressed with this most recent bill, so expect it to be addressed again in future legislation.