Is it ordinary house coal or might it be low volatile?
https://www.gov.uk/guidance/selling-coal-for-domestic-use-in-england
"
Enforcement checks
Enforcement officers will check that suppliers and retailers are not selling traditional house coal.
They may check:
traditional house coal is not being displayed for sale in retail outlets and online
records at registered coal merchants to confirm that traditional house coal is not being sold
records of the types of coal sold (for example, traditional house coal, anthracite, lignite)
Fines
Coal merchants and retailers could be fined by local authority enforcement officers if unauthorised coal is sold to domestic household customers.
Depending on how severe the offence is this could be:
a £300 fixed penalty fine (FPN) issued by the local authority
a more substantial fine issued by the courts"
I think the Columbian and Polish coals may possibly be low volatile semi bituminous rather than bituminous coal which is what house coal is.
A quick google suggests that
What type of coal is Colombian coal?
Colombia's coal exports are a low ash, low sulphur thermal coal, the benchmark calorific value (CV) from Puerto Bolívar being 11,300 Btu/lb.
So maybe that does not fall into the house coal category.