Yes, it's a Kafue Flats Lechwe (Kobus leche kafuensis).
True Red Lechwe (K. l. leche) are rare in European zoos, except in France where a fewmore places have them. Only Aqualeon has Black Lechwe (K. l. smithemani).
Nile Lechwe are a separate species as noted above (Kobus megaceros), and the males in particular are very distinctive. Zootierliste lists 19 European zoos with Niles, including 3 in the UK (Whipsnade, Suffolk/Africa Alive! and Belfast).