I've been suddenly overwhelmed by the urge to visit Las Vegas for the first time, but would also like to include a few days in Florida on the same trip, so I'm figuring a route LHR>LAS>TPA> LHR
I'd be starting out mid March, and using MR points (could be Avios) and wanting to fly J or F

Recent learning on here makes me think someone will have an idea of the best, and most cost effective way to do it. Any ideas would be welcome.

One last point - I'd rather do the LAS>TPA sector as a night flight so that I don't waste any daylight hours on a plane!