At the IVFDF last w/e I noticed the Exeter UK region is ready for the switch-over and Cumbria have already done it.

Firstly - in the UK the aerial best suited for digital needs to cover a wider frequency range and that means a yagi with elements at different spacing (logarithmic at that) and bow-tie elements. If close enough to the transmitter maybe you can get away without one. If you wait till switchover maybe the old aerial will suffice, but don't bet on it. They will boost the power because interference is no longer an issue (oh yea?) and reception in marginal areas is. This will also be plan in the US from what I read. Where I live they haven't even bothered to provide repeaters for Channel 5 - so don't expect universal coverage or the same coverage.

I use a loft aerial with masthead amplifier which just does it unless the roof is laden with rain or snow or there is a mains LAN operating locally. Or sporadic E (from sunspots) is particularly strong. Or something I can't imagine. Come switchover this will be OK (I hope).