To participate in the 2018 Wimbledon Ballot, you need not only to have an LTA British Tennis (BT) number but you need to opt in to each year's ballot. Last year 300 of us opted in by the cut-off date in Feb 2018. So far only 125 of us have opted in. The more that are entered into the ballot the greater will be the number of allocated pairs of tickets in the ballot. Please do so now.
If you don't yet have a BT number you can join here, and can then opt in to the 2018 ballot. (You must affiliate to Brondesbury, which is in the LTA's Middlesex region.) Alternatively you can call them on 020 8487 7000, which might make it easier to enable multiple family members to opt in.