The Metropolitan Police has asked groups planning to demonstrate during or in advance of Margaret Thatcher’s funeral to make themselves known to officers so that their “right to protest can be upheld”.

The call, which echoes similar ones made in the run-up to the Olympics, is an attempt to avoid any outbreak of violence or public order issues which might threaten to mar the funeral procession. However, the suggestion will anger those who say the right to protest should not need prior authorisation by police.

The plea comes amid criticism that taxpayers will have to foot the majority of the estimated £8m-to-£10m bill for hosting the ceremonial funeral. Lady Thatcher’s estate is making a contribution and the rest will come out of the public purse. Mindful of generating further unrest in the run-up to Wednesday, Downing Street said it would only confirm how much the funeral will cost the public once it has taken place.

Groups of various political hues have used websites and social media to encourage some sort of protest or public statement on the funeral day. Suggestions have ranged from anarchist groups promoting violent demonstrations and direct action to more sober offerings such as silent vigils or wearing a single colour in protest at Mrs Thatcher’s divisive legacy. A separate call has gone out to hold a mass party and protest in Trafalgar Square this Saturday at 6pm.

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