Thanks for the help which is appreciated. Given the answer, what is the extra word in 14 down - is it 'these'?.
Incidentally I see that 28 down is a French River. I taught, immediately before retiring to the Norfolk sandbank, in North West University, South Africa ( which had once been the heart of Apartheid and was now a marvellous multiracial institute). I was therefore convinced that 28 down was Vaal!!
A lot to do this week - AZED is a playfair.