Land Rover 90 gear selection problem

Update on the problem i was having. Now fixed(i think). On Christmas eve i decided to just try bleeding the clutch fluid, and see what state i was in, well it was black, it appears the previous owner had simply topped up the clutch fluid before he sold it to me, as the last bit of fluid that came through was the right colour. Anyway i have now refilled it and fixed the fuel leak i found whilst underneath doing it and driven it about 100 miles over the last week and all seems to be ok with now fluid loss. Thank you for all of your advice.