British killer Simon Hennessey, who escaped from a Gloucestershire prison in 1998 where he was serving a life sentence for murdering his aunt, was recaptured in Australia earlier this month.
Avon and Somerset police hope he will be extradited from Australia where he has been arrested on suspicion of several counts of credit card fraud.
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Nigel Farage warned on Friday Britain was "far less safe" and exposed to Cologne-style sex attacks because of open-door immigration.
Arthur Simpson-Kent, 48, admitted killing Ms Blake and their sons according to his lawyer.
Two brothers have been arrested on suspicion of murder after their parents were found dead in their own home over the weekend.