The UK's old hand baggage restriction was 1 item no larger than 56cm by 45cm by 25cm - ie a maxium volume of almost 62 litres. Plus on most airlines you were allowed a "personal item" such as a "laptop bag". For example see the sadly rather short lived "new" allowances from BA.
The new hand baggage allowance is strictly one item no larger than 45cm by 35cm by 16cm - ie a volume of just over 25 litres. But any laptop bag or suchlike must fit within your single item. So the allowance is down by 60% if you aren't taking a laptop, but by considerably more if you are. In fact, a typical chunky laptop bag takes up most of the new allowance, so it's likely that if you're on a business trip you can no longer fit all your clothing into hand luggage. That isn't going to please these guys. Money talks, and a £20,000,000,000 trade surplus talks quite loudly.
The embago on fluids seems proportionate, given the description of the threat given, and the seeming credibility of the chemical experts describing liquid explosives. However, it does have the side effect of wiping out all duty free sales of alcholol in the departure lounge, which isn't going to please the retail tenants of these guys. And while you may think that the Ministry of Motorways is only interested in roads, those guys had enough clout to make it veto the SRA's propsals to abolish the Gatwick Express to free up paths for more trains to Brighton.
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