You can get the caliper for €530.-/£470.- plus shipping cost from German Leebmann24.de shop. (per caliper)
£900.- (per caliper) looks like the classic dealer rip-off.
https://www.leebmann24.de/bmw-ersatz...=34&bt=34_2033
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335i F31 RWD in SB || Powertrain: Active Autowerke Flash Tune Stage 1 | AA Charge Pipe | AA FMIC | GFB DV+ | xHD Trans-Flash | Quaife LSD | Cyba 3.5" Carbon tips || Chassis: 20" 405M | Wiechers Strut Bar | Rear M-Diffusor || Brakes: 18" M-Perf Brake orange 370/345 | EBC YellowStuff pads all around || Various: LED bulbs: Fog-L. front | Turn Signal f&r | Brake L. | Reverse L. | Rear L. | Rear Fog L.