SLR's all have the Anti-Cav. as standard I believe.
Dry sumping has more benefits than just protecting the engine it also release a couple of BHP I believe.
I agree with Peter Anti-cav. is good and does help to prevent damage from oil surge as the oil is taken from the anti-cav. tank all the time. when the pump is starved the tank ampties slightly (it holds two litres of oil). As soon as the oil is being picked up again the tank goes back to full.
Just having an extra two litres of oil in what is a relatively small oil system is of definate benefit in terms of oil temp as more oil means lower temps.