No deal will mean life goes on with tariffs on many goods in either direction. As we have seen over the last two years the Foreign Office has seemingly lost everyone who has diplomatic ability. Funny, they used to be famously good at it. This is not promising for the chances of equitable trade agreements with anyone after Brexit. Life will go on but it appears it'll be a damn sight more expensive.
If the next govt wants to renegotiate re-entry to the EU the terms will be much less appealing than first time around.