Well, the major factor for you operating your Baron in the U.K. is our horrendous fuel costs compared to the U.S.
We pay about £1.20 a litre for 100LL avgas. Assuming your Baron holds 194 US gallons, (thats about 680 litres) it'll cost you about £800 to fill it!!........ $1350!!
Thats right...$1350 for a full tank. Not sure what your fuel burn is in a Baron......but it'll be quite alot of $$$$ an hour.