Dont forget at the moment IMC & Night public transport in a single is illegal in Europe. It might change in the future but for now its a no go.
For flying engineers around, in a 206 is likely to be too slow and have too short legs. Used to do a lot of it, minimum was a c310, but normally a Twin turbine/ light jet.
Even a turbo stationair only gives you 600 kilos between empty and max take off weight. Its not a lot of freight and you cant go very far.
The Harrods idea has some merit as you could avoid the public transport issues. However you'd probably do better just sticking it in your luggage and going easyjet.