BRITAIN is standing firm in its claim that a proposed permanent naval base on Stonecutters Island is comparable with the facilities of the British garrison in Central. After three days of detailed technical discussions, defence experts in the Sino-British Joint Liaison Group (JLG) were unable to resolve their differences on the naval base, which will be used by the People's Liberation Army (PLA). But, there were signs of progress in a climate of negative relations over the row about the territory's political future. The British side's negotiator Alan Paul said: ''On some matters we have been able to reach agreement, and that is good.'' He declined to go into specifics, but it believed some minor technical points were settled. Mr Paul insisted that ''on others we have not reached agreement but we, for our part, will continue our efforts''. Chinese side leader Luo Jiahuan said: ''We have clarified and solved some problems in this meeting.'' In an effort to speed up an agreement, Chinese naval experts are understood to have come to Hong Kong to attend the three-day technical discussions, which ended yesterday. China is demanding much bigger headquarters than those proposed by Britain. While Chinese officials argued that their demand was not excessive and was similar to the facility at HMS Tamar, British officials maintained that the base they propose is similar to the one in Central. The new naval base plan is understood to be very complex, and goes into minute details such as the number of toilets needed.