Chartering a flight from UK to Poland and back

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Hi JCB 3CX,
2 IFR airports nearby are Heringsdorf in Germany, EDAH, and Szczecin, Poland, EPSC.
Since it's a charter, your choice. Personally, I'd go for PIK instead of EDI. Although, it depends on how big (heavy) the aircraft is from a security screening POV.
Airport/FBO opening times need to be considered too.
Probably a 2 ish hour flight.
5 pax, you could get away with a Phenom 300 or Excel. No need for security screening as the aircraft is less than 10 tonnes.
15 pax? Ok, now your costs have easily tripled. You're looking at least a Global Express or Gulfsteam 550. Embraer Legacy too.
Catering? Transport?
You'll need to find a broker/charter company.
Good point SWBKCB - luggage!