You have a higher chance of being allocated tickets for Wimbledon through the club ballot than through the public ballot.
To enter the club ballot you must be a British Tennis Member (it's free!), join on the LTA website (https://www.lta.org.uk/member/). You also need to make sure you select Bicester as your club and add your BTM number to your membership record. You can update your membership record using the link to the membermojo system on the Join or Renew Membership page in the membership section of this web site. Once you're a BTM member you should be prompted to "opt in" to the Wimbledon ballot by an email from the LTA at the appropriate time.