They passed a Bill to instruct the PM to ask for an extension in the event of No Deal. The EU can always refuse that since our law has no hold over them. They are currently fighting over whether Boris will do it and the prorogue. If the EU agree an extension it's just more of the same pursuing a deal. They have to run awareness campaigns so people can make provisions like firms that import/export or use EU staff (which they will have been working on for ages just in case), travellers into the EU, etc.