Did you say all UK 135's?
All of Bond's EC135s, according to the BBC report. (No press release on Bond's website yet.)
"Bond Air Services suspended flights on all 22 of its EC 135s after a fault was found on the North West Air Ambulance. ... Eurocopter said the decision taken by Bond did not apply to the rest of the Eurocopter fleet in the UK - a total of 57 aircraft."