[quote=""x555""]........Is there a magnetic socket set available ? as something like this would be great on certain jobs

You're not alone I genuinely belive there is a big gap in the magnetic hand tool market.
I'm not sure if a magnetic U/J or extension bar would be the answer or not, the logic being this would magnetise an attached socket bit. link showing a 3/8" u/j
I did a quick search and found these results on a uk site.
Note the Ko-Ken socket bits can be bought individually. The other option would be to go for a small set like those from daraper that have magnetic bit holders or magnetic t-bars. Not sure how much magnetic force gets transfered to the actual bit & in turn whether theres enough to hold a nut/fastener.
I bought a magnetiser which works with mixed reults depending how long you work on the fastener after charging the bit similar to this