Phew wot a scorcher! Last few. 53a Alien you discovered in small, unknown spacecraft (5) S?Y??
46d Composer of regulation, not the first to feature in Dickens (6)
?O?L??
31d The Irish wind up Nepalis: lie abysmally (7,5) U?L?E?N/???E?
50a Spanish girl's holding a hundred and one in reserve (7) ??I?E?S
Thanks in anticipation