and/or what can I do to get this location changed to being UK ..if any as won't it effect my seo etc
Andy it makes little difference at all - the world is quite a small place in internet terms - what Paul says is correct and wh have a number of high ranking UK sites on US servers.
There is a huge difference in costings within the UK and US, for instance our US servers are running with 12Gb ram, 16 cores, 4TB raid drives and several backups a day, whereas our UK servers are lower spec higher contention ratios on the switches and do not benefit from our extensive backup systems.
Its all swings and roundabouts as far as SEO goes down in the deepest bowels of the Google alogorythm you may lose a brownie point but in my experience it just doesnt matter, content is far more important than physical location.
At the end of the day if you want to move to a UK server just let me know