Theresa May has refused to say whether Britain's security services are accessing medical records and other potentially sensitive information.

The home secretary said she did not want to "go down the route of giving information about the sort of data sets that are being acquired".

She was speaking to the draft Investigatory Powers Bill committee.

The government's anti-terror legislation watchdog David Anderson is set to warn in a report that Ms May needs to come out and make the case to MPs and the public for the bulk collection of data.

If the government does not do this, it risks the practice being outlawed by the European Court of Justice, he is set to warn.