I found this really tough. But it may be that I just can't concentrate. His Nibs has gone off to uni! Of course, it's for the best but I feel so lonely without him. On to the crossie.
I've managed, eventually, to get answers to all the clues and learnt a brand new word (issei).
12d Quits flat, base for assignment in Rugby. I think the answer is "even stevens" which is quits but the rest?
49 ac Which sees gas production at its peak. Is the answer "summit talks"? I see peak there but "its" and "Talks ", singular and plural make me nervous.
54ac A number of just people isolated. with the letters I have "only the lonely" fits but why?
steven