Sure, if you look at a £4:00 bunch of flowers in bare terms, it's unlikely that more than £1:50 is transport. So even doubling the cost of transport won't push the flowers out of economic viability.

But doubling the cost of transport across the whole economic sphere renders huge portions of the transport industry as currently configured non-viable. People will simply cease to operate in the way they do currently because the margins become nonsensical. Large warehousers like supermarkets will cease their 800 mile round trips between sorting centres etc etc, localism will predominate. So flowers become a casualty of the entire rationale unravelling rather than being priced out of the market.

keep to the Fen Causeway