Hmm, I just worked it out to be £135 for 18 months in a 6% ISA. Maybe the stock market? My dad is pretty good with shares, he made £1000 in 2 years from a £1000 investment. Main profit was from oil companies.
Well with the stock market there is associated risk. I think there is a lot less risk or even zero risk with an ISA, although i may stand corrected. You're getting £150 or whatever in your pocket with no hassle or work from you whatsoever, that's a few nights out.