160 to 4 is always manageable at LHR, when you generally get a long final...180 to 4 can be a problem, but have only been asked for that in Germany.
Just as an aside, my company is pushing for CONF 3 landings on the 320 and 321 as a fuel saving measure...can make for some fast ol' approach speeds with heavy aircraft...I generally advise ATC if it's getting close to 150kts. Limits the potential for embarrassment..
