As far as I know I haven't bought anything online or do anything other than routine stuff i.e. emailing, ppruning etc. I'm pretty sure whatever occurred coincided with the kids activity (They know 'nothing' ala Sgt. Shultz..). I downloaded Malwarebytes as suggested and it found backdoor.hupigon which it seems to have eradicated. I'll be de doing a few rescans before I bank..Thank you all for your advice.
Cheers
Octane