I'd imagine the issues with these would be even greater, as whilst the majority of USAF RC-135s have been under L-3 (and it's predecessors) control for a long time, the RAF's aircraft have spent most of their life as KC-135s (presumably under Boeing design control) - I may be wrong, but I don't think any of the USAF RC-135Ws spent any great time as tankers (if at all), most being 135B models originally.