Hi Rockky,
Which airport are you flying into? Heathrow or Gatwick?
I don't think you will have a problem coming into the country - it's leaving the country that is giving people problems! There have been delays getting to Heathrow and checking in due to heavy security, ( not sure about Gatwick but I assume it will be the same.)
We are taking our daughter to Heathrow on the 4th and plan to try and get there at least 4/5 hours before her flight to Africa. I haven't heard of any problem with arrivals.
Are you hiring a car at the airport? Unless you've been here before and are familiar with driving on the correct
side of the road, I would suggest you get a good roadmap. If you want help with any directions e.g.which roads are good and which to avoid then please feel free to pm me. We live in Hampshire, about an hours drive to London.
I'm sure you will have a wonderful time when you're here. Apart from seeing a few more policemen around, life is just the same as normal so come and enjoy!
Pack your wellies and umbrella though - we've had a lot of rain!