I would (I know a lot of these are not anarchistic, but neither is being the PM) -
Abolish the Monarchy
Legalise cannabis
Abolish any law that stopped people doing what they wanted with their own bodies (so long as their actions didnt hurt others)
Allow all adults to marry whether gay or straight
Remove religion from the state entirely, although not banning it or making it illegal
Noone will own land -it will be collectively owned
Remove all British troops from overseas
Remove all US air/army bases from Britain
Nationalise all industries
Nationalise public transport
Abolish titles such as sir and lady
Abolish copyright laws
I would allow the Welsh, Scottish and Cornish the right to have a referendum on independance
I would change the national anthem to something that celebreas the people and not the royal family
Legalise abortions for all women for any time during the pregnancy
Abolish all forms of tax bar income tax, which will increase with wealth
Ensure that the law protected the equality and freedom of every single person
Ban all forms of unecessary hunting
Close down all nuclear power plants and try to find renewable sources of energy
Change the Union Flag to something more modern - a public referndum will be held to find it
Bank Holidays will be the current ones plus every first Monday of the month
Abolish tuition fees for all students
Abolish all tests and exams for school children under the age of 11
Allow immigration up ton the point where they replace the numbers of emigrants and those that have died
More to be done to tackle the causes of crimes
Use of palaces as flats and hospitals
Lower the voting age to 16
Ensure that women and men are paid the same amounts for the same job
Ensure that for every tree cut down in the country, two are planted in its place
Halt to building of new homes whilst old ones are renovated
Decalre Britain a neutral state
New prison system will consist of Grade 1 (high securityy - murderers, rapists, peadophiles etc), Grade 2 (other violent crimes), Grade 3 (fraud, blackmail etc) and Grade 4 prisons (remand prisoners)
All murderers,rapists and paedophiles will be given life without parole
Where possible, people convited of minor/non-violent crimes will be given community service and/or drug/alcohol rehabilitation
On Sudnays all cars will be banned from city centres