LIBERAL Party chairman Allen Lee Peng-fei yesterday made a telephone plea to top Chinese official Lu Ping for Beijing to give some ground in the political reform negotiations. He urged the Hong Kong and Macau Affairs Office director to accept Governor Chris Patten's conditional offer to split discussions on the 1994-95 electoral arrangements, claiming the three issues involved could be resolved. Mr Lee - in Beijing as part of a delegation of the Outstanding Young Person's Association - said he told Mr Lu most legislators did not support the retention of appointed district board seats, and would not accept a voting age of 21, even as part of a deal struck between the two sides. He also urged China and Britain to reach agreement on the single-seat single-vote system proposed by Mr Patten, which legislators have already voiced their support for. But the Hong Kong and Macau Affairs Office made no response to the Liberal Party chairman's plea. In Hong Kong, Democratic Alliance for Betterment of Hong Kong chairman Tsang Yok-sing said it would be hard for the Chinese side to accept such conditions, and that the talks were entering their final stage. ''Both sides should clearly know the deadline of the other,'' he said. Also in Beijing, Preliminary Working Committee member Maria Tam Wai-chu said the chances of reaching an agreement were lower than any time previously. Meanwhile it has emerged that the Governor is expected to visit London again in January for high-level talks during a trip which will also take in a meeting of the World Economic Forum in Davos, Switzerland. A British source said this trip would represent the final cut-off date for the negotiations, although this was denied in Hong Kong yesterday. The deadline is more widely expected to come during Mr Patten's visit to Britain next month. However there were suggestions yesterday that this week's 15th round of talks may not be the last, with the possibility of one further round being held before the November 10 Cabinet Committee in London. The Governor is also expected to visit Australia next February.