I have not yet had time yet to read fully all the information, but at first sight I am deeply disappointed that whilst the DfT and NATS appeared to understand the industry standpoint, the security aspects have (as was always inevitable) overridden what could have been achieved by a responsible on-shore helicopter industry: well practised at operating into or close to major sporting events.
Perhaps there is scope for damage-limitation.
On this occasion I don't think it's fair to blame the CAA, but the question must be asked of Government as to compensating operators who may be grounded by the restrictions.