Thanks all for the advice, suggestions and WARNINGS!!
I've decided to go for a (hopefully!) decent Circular Saw instead. I currently have a Screwfix "Ferm" circ saw which was cheap and is great for rough cutting but it's not quite refined enough for very straight, accurate cuts :x
I have purchased a Makita 7 1/2 inch Circular Saw (Model 5704RK) - brand new off ebay for £75 inc postage compared to £89.99 from Screwfix. Hopefully nobody will tell me this is a duff! (I have a cordless drill drives from Makita and love it - that was a good enough reason for me to go with their circ saw!).
I will spend a bit of time making a decent straight cutting jig for it - I've seen some good examples in books and on t'internet. It'll take up less space in the workshop and HOPEFULLY give me much better results than a £100 table saw would.
The main lesson learnt:
When you feel the need to spend money on a new power tool and people tell you not to, just think of a DIFFERENT power tool to spend your money on instead... :lol:
Cheers
Gary