Hiya
I use GreenThumb - I have the regular quarterly service but dont go for the extra scarifying etc. in the Autumn.
They came recommended by the Vice-President of our Gardening Club and all of the Committee (including me now!) have the Green Thumb man.
They are very nice people, both in the office and the man who comes round, reasoonably priced and yes my lawn looks great. It was getting in a very sorry state with weeds etc but the weeds all pretty much died after the first treatment and now the lawn just keeps getting greener!
Definitely recommend !