The Counter-Terrorism and Security Bill, being introduced to Parliament this week, will make it an offence for insurers to reimburse ransom payments.
A judge in South Africa is expected to decide later if the case against Shrien Dewani should be dismissed.
The care home owner, 34, has always denied plotting to kill his new wife Anni during their honeymoon in Cape Town four years ago.
But prosecutors claim bisexual Dewani arranged the "hijack-gone-wrong", in which he would escape unharmed, to get out of his marriage.
The state alleges Dewani paid less than £1,000 to set up the hijacking in November 2010.
Dewani maintains the money was actually for a surprise helicopter trip which taxi driver Zola Tongo was helping to arrange.
Tongo was jailed for 18 years over his part in the attack. Another man Mziwamadoda Qwabe is serving 25 years.
Gunman Xolile Mngeni, who fired the fatal shot, was jailed for life but died of cancer in prison last month.
Judge Jeanette Traverso has already dismissed sections of the prosecution case, describing evidence on Dewani's sex life as irrelevant.
If she feels there is insufficient evidence to support the claims she could direct a not guilty verdict, which would see Dewani walk free.
Most areas will have a dry day, and once overnight frost and fog lifts there'll be plenty of sunshine.
However, cloud will gradually thicken in the northwest bringing rain, some of which could be heavy, especially across western parts of Scotland.
A brisk wind will accompany the rain, but much lighter winds are expected across England and Wales.
Top temperature 9C (48F).
A British banker accused of killing two Indonesian women in Hong Kong has been declared fit to stand trial for their murders.
A judge ruled that Rurik Jutting, 29, was mentally fit to stand trial next year following two weeks of psychiatric examinations, the AFP news agency reported.
The bodies of Seneng Mujiasih and Sumarti Ningsih - reported to be sex workers - were found in his flat on November 1.
Mujiasih was found with knife wounds in the living room, before Ningsih's body was discovered hours later in a suitcase on the balcony.
Mr Jutting, a Cambridge University graduate, recently worked as a securities trader at Bank of America Merrill Lynch.
The case was adjourned until July.