www.eccauk.org has some great information in their Info link in regards to vaping, studies, a letter for employers ect...
The law doesnt cover ecigs...at all. So legally you can vape anywhere you want, but as said above, its down to property manager/owners. Tesco was the most recent case in point where a shop in Wigan put up a rather nasty notice using the smoking law to enforce their no ecig policy, which was incorrect and a blatant lie. Vapers took to Facebook and Twitter and Tesco investigated the claim that this sign existed, found out that it did and ordered it removed. However, it doesn't mean they changed their policy, just are now aware that the wording they used was wrong on more than one level.
Some pubs (mostly non chains) will allow vaping if you ask. I vape in both of the bingo halls here and have in Frankie and Benny's. Lovely lil place out in Burtonwood ( @
Gonloopy have you ever been?) called Fiddle in the Bag, scurbby place, but great food stuffed with memorabilia and they allow vaping.
However, the idea of Dont Vape where you cant smoke, is a nice one, but it is always best to ask, and ask until you find someone whos word is "rule". Some places will allow them without too much of a hassle, others will bend if you explain what it is. Also using NON cigalikes and referring to them as Personal Vapourisers helps in the instance someone gives you that "I dunno about that" kind of look.