Thanks for ICRC link-yes it is a bit tricky. A few useful pointers on the index cards:
1]abbreviation 'all'=alleman [German]
2] bear in mind that French like being different

-francophones usually use surnames first,as I just found,wasting my precious Sunday! So enter surname first.
I found my Richard Noschke no.42081 ,in the registers,listed at Sratford 'Stfd' where he was first interned,the index card dated 22.3.18 which would refer to repatriation date as the 2nd and last register entry is marked 'repatriated'. Under home address or birthplace on list 49,pg 1075 "3 Boston Rd,Hatherley Gardens,East Ham,London,E" plus birthplace:"Gross Lubholtz,Preussen". No mention of Alexandra Palace where his diary records that he spent most of his time after being transferred.
ICRC registers contain extensive lists of names,so well worth the search.