Thanks for response, the budget is not an issue here. I use Ernie ball slinky on most of my guitars 2221 or 2222 as I'm a Maiden , they use them and they sound and feel great. The fella from the shop said they could be Elixir then said they're not Elixir but likely to be Fender, as the guitar is strung up at factory with Fender string, but as you say they go rusty in the packet and I bought the guitar 18 months ago with no sign of rust on strings.
I should have asked what strings they were, I think I even did from the younger lad but my memory doesn't serve
Suppose lesson learnt. I just go with Ernie's