Thanks for feedback, following on from suggestions I set the master bus to mono and it gave exactly the same issue as playing on the iphone, sounds like only a 'wet' reverb signal on the vocal tracks is playing. So I decided to try something else......the vocals/backing vocals are routed to a bus with eq, compression and Perfect Space Reverb (main vocals panned middle). I tried exporting/emailing the track to my phone (same method as previous) without Perfect Space and the vocals sound fine and back up front again (but without reverb of course). Is it some setting in perfect space I am doing wrong, not had chance to study the set up yet but if anybody has any obvious theories? Forgot to check if I am exporting in stereo but am mixing in mono. Good reminder to switch to mono occasionally, will put a note next to my 'NOW SAVE, IDIOT' sign after loosing hours of work on numerous occasions!

That explains it. You don't normally add reverb in series to your signal. You add it in parallel. 
 
I'll give you an example of how I set up a mix. For simplicity I will not use any sub mix buses. 
A sub mix buss would be put between your tracks and the master. 
In the Top Pane: 
will include the Audio,MIDI and soft synth tracks. The Audio and Soft synths Audio are all output to the Master Buss.
 
In the bottom pane: 
A Master Buss - output to interface
A Reverb Buss - output to master
A Delay Buss - Output to master 
And there could be one more for guitar effects like Chorus or Leslie. 
and you might also have a metronome and headphone buss (that have nothing to do with your mix) 
 
Tracks and buses all have an effect bin. 
I will put  EQ or compression in the track bins. I realize some would also put guitar effects here like distortion, I record those sounds live, so each to there own in this matter there is no right or wrong.  All other effects will go in a Buss effect bin. And only one Effect per buss. 
 
I will put the LP 64 Multi band in the Master bus bin. This is in bypass mode until final export to avoid tracking latency issues. . 
 
All your tracks have the ability to insert an effect send to any of the inserted buses. You use this to send part of your tracks signal in parallel to that effect. 
This also has all your tracks sharing the same effects which makes for a more natural sounds-cape. 
People are not used to hearing sound with 6 different spacial "rooms" They want to be in one place. 
 
Of course you could put an effect in the track bin and use the wet/dry to mix, but it is so much better when using console view to set it up like I do. All your controls are easy to see and reach, and you can solo the effect buses or mute them. 
 

Thanks Mr Cactus Music, much appreciated, still have a lot to learn!