If you're crazy enough, how about:

Iberia Airlines Flight IB4185 on an Airbus A320 (jet) in business class
Departs London, United Kingdom (LHR) Fri, Jan 28 11:45a 2 hrs 0 min
Arrives Barcelona, Spain (BCN) 2:45p

Iberia Airlines Flight IB1134 on an Airbus A320 (jet) in business class
Departs Barcelona, Spain (BCN) Sat, Jan 29 2:45p 1 hr 25 min
Arrives Seville, Spain (SVQ) 4:10p (24h max in BCN)

Iberia Airlines Flight IB1129 on an Airbus A321 (jet) in business class
Departs Seville, Spain (SVQ) Sun, Jan 30 6:45p 1 hr 25 min
Arrives Barcelona, Spain (BCN) 8:10p

Iberia Airlines Flight IB4180 on an Airbus A320 (jet) in business class
Departs Barcelona, Spain (BCN) Sun, Jan 30 8:55p 2 hrs 15 min
Arrives London, United Kingdom (LHR) 10:10p

That is £203 according to ITA, but probably £216 on Expedia. And then instead of hanging around in BCN, from the IB website:

Viernes 28 Ene IB 1724
E Business 16:25 Barcelona Terminal B 17:05 Palma de Mallorca, Palma Mallorca Sin paradas
M88 0h40min

Sábado 29 Ene IB 1711
E Business 11:50 Palma de Mallorca, Palma Mallorca 12:35 Barcelona Terminal B Sin paradas
32S

...for €237 or £170.

6 biz sectors, an evening in Palma de Mallorca and a night + day in Seville for £390.