Thanks I'll pop into three and have a look. :)
Had Honor6X since launch bought from VMALL UK website. Very pleased with it. Often have offers on. Extra functions like built in wi-fi bridge to give connectivity to "deaf" wi-fi on kids iPhones. Go and play with one in Three shop and you can walk away with full UK warranty open to any network. I know 3 others who have bought after having a play with my handset and all agree that great value for money compared with the overpriced Samsung flagships
both seem good phones I'd still recommend the mi5s. although the honor has radio built in and supports Voltle calling (which I think is calling over 4g but not entirely sure). If you would like those 2 features I'd opt for the honor 6x.
honor 6x can be bought for £220 in UK (3 store) so comes with UK warranty. xiaomi won't have warranty :(
Thanks for all the help :-) specs wise I'm after... minimum 3gb ram/ 32gb storage half decent processor band 20 ( apparently thats essential for good 4g in UK) The honor 6x as a twin camera ( which looks good) but is it all that? thanks again :D