Finally got things sorted. Someone suggested reversing the throttle channel the trying again & this is what I thought I'd tried but stupidly I didn't look at the labels on my transmitters reversing switches just assumed the one under the throttle was for throttle & the one under steering was for steering - WRONG!!!
Realized my mistake reversed the correct channel, re-calibrated ESC & hey presto worked 1st time.
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Michael 
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