I second Dave's suggestion if you don't want a very high sheen. For a table top I'd use four or five coats, flattening the finish for the first two or three - usually with a cabinet scraper which is far better than sanding for this purpose as it flattens better (and shows very clearly where the finish is not yet flat).
You can get a higher sheen by a final polishing with a higher grit abrasive - if you use Abralon you can go to 1000 or even 4000 grit.
To apply the finish I use foam brushes which I find give me a smoother result than a bristle brush.
I find the Ronseal is very tough - resistant to heat and stains and easily wiped down with a damp cloth.