<sod >Half of extremist terror plots foiled by British policeÂ in the past two years have involved a plan to buy guns, police have revealed,Â amid a surgeÂ in gun seizures in the UK.< eod>< sod > It comes as police revealedÂ half of extremist terror plots foiled by British policeÂ in the past two years have involved a plan to buy guns,Â amid a surgeÂ in gun seizures in the UK.< eod>