Dear Edward,
I shall be in London for a couple of days next month, and I was wondering if we could meet together. It has been such a long time since we met and I am very anxious to hear how things are with you.
What about Monday, April 5? If this would suit you I suggest we meet at the entrance to my hotel, which is "Armour Inn", at 12.30.
Please let me know if this is convenient for you.