Saunders seems to be concerned only with attempts at bombing Parliament - and forgets the murder of  Ian Gow MP at his home in 1990 - while ignoring the many terrorist attacks, mainly by the IRA, from the 1970s onwards. The worst attack was the destruction of  Pan Am 103 over Lockerbie, Scotland, by a bomb probably planted by Iranian, not Libyan, agents. 270 were killed.

Many of the other attacks were directed at Jewish targets. Jewish schools in the UK, as in France, are all heavily guarded because of the threat of attacks from certain religious groups.

The following is a list of attacks on mainland UK, not including NI, from the 1970s.

https://en.wikipedia.org/wiki/List_of_terrorist_incidents_in_Great_Britain