Thanks Mixture
Previously I have enjoyed the luxury of a large desk PC for fixed IT work and grown used to the visual luxury a large screen offers. Now I am having to look for a compromise as whatever I purchase will have to do for fixed and portable IT needs.
Your advice re the 15 screen is sound and I will see what is available with I5 or i7 processors.
The hard disk size really does not matter as I usually back work etc. up to at least two alternate external disks every 3 days as having experienced the dreaded blue screen with a less disciplined approach to file storage before I have no wish to be caught out like that again. So providing I am not going to pay much more for unwanted storage space then 500GB or 1TB is of no consequence.