The LTA rankings include domestic and International - the International points are multiplied by 10 (??) in the calculations.
However things do looked mucked up ... Jade Curtis has 18750 points off only 31 WTA points, yet Naomi has 11750 off 151 WTA points!
The LTA ranking is used as a national ranking in tournament entries where no international or european ranking is available, so will not affect any of the international players.
well if you are top 5 in singles in britain you get all expenses paid for certain tournaments, and i think top 15 you are allowed freely to train at roehampton whenever. maybe bit wrong though.