All,
Thanks for your comments (including the references to the earlier strings) - DC looks good - I'll search around for a good price.
Looks like (UK) approx £ 259 for DCH10-13.4 but (gulp !) £ 525 for the H10-13X (with ANR).
Cheaper Peltors (used by my PPL school seem to be c. £ 165 ...).
D 129