Household debt and GDP statistics are published by the ONS, and are available here: https://www.ons.gov.uk/economy/nationalaccounts/uksectoraccounts/timeseries/nnpp/ukea
In nominal terms, the level of household debt has risen over the past five years. However, it has fallen as a share of GDP. In financial year 2016-17, household debt stood at 95% of GDP, down from 98% five years ago, and 102% before the financial crisis (FY 2007/08).
The independent Financial Policy Committee was set up by the government to assess and mitigate financial stability risks, including from household debt. The FPC has taken action to ensure against a significant rise in highly indebted households.