He's broken at least two laws which carry a maximum of life in prison.
Criminal Damage with Intent to Endanger Life (Section 1(2) Criminal Damage Act 1971)
Maximum sentence: Life imprisonment
https://policing.uk/offences/aggravated-criminal-damage
Offences against the Person Act 1861
Impeding a person endeavouring to save himself from shipwreck.
Whosoever shall unlawfully and maliciously prevent or impede any person, being on board of or having quitted any ship or vessel which shall be in distress, or wrecked, stranded, or cast on shore, in his endeavour to save his life, or shall unlawfully and maliciously prevent or impede any person in his endeavour to save the life of any such person as in this section first aforesaid, shall be guilty of felony, and being convicted thereof shall be liable... to be kept in penal servitude for life.
https://www.legislation.gov.uk/ukpga/Vi ... section/17
