The UK basically doesn't have any trade agreements of its own. They've been part of the EU for more than 40 years, so nearly all trade agreements they had were replaced with EU wide trade deals.
They don't even have separate trade agreements with the EU, which is going to hit them hard without a deal because the EU is their biggest trade partner and they'll be suffering the tariffs both ways and without any mitigation granted by a trade deal, as well as a complete lack of customs enforcement and coordination preparations for trade with the EU. They've simply neglected to prepare for that except for saying things like 'oh technology will handle that', even though the technology doesn't even exist yet, nor does the infrastructure to support that technology.
They don't even have separate trade agreements with the EU, which is going to hit them hard without a deal because the EU is their biggest trade partner and they'll be suffering the tariffs both ways and without any mitigation granted by a trade deal, as well as a complete lack of customs enforcement and coordination preparations for trade with the EU. They've simply neglected to prepare for that except for saying things like 'oh technology will handle that', even though the technology doesn't even exist yet, nor does the infrastructure to support that technology.