I used the foam gloss rollers from screwfix when I did my 110 and my series 3. I only used a brush for the difficult part of the bulkhead. It take a little bit of patience to work out how much paint to put on and much to "work it" to get the bubbles out but you soon get the knack of it. You do not get a perfectly smooth surface from the roller but it is good enough on a land rover you have to be very close to notice.
I can post up some pics of the finish if you want, the series was done about 4 years ago and 2 for the 110.