ubercart php memory problems

Hi Folks,

Moving on to test UBERCART I got this error on the module install.

Fatal error: Allowed memory size of 20971520 bytes exhausted (tried to allocate 42 bytes) in /home/virtual/irlgov.info/public_html/drupal/includes/database.mysqli.inc on line 162

I have only got 20m available in the php.ini file. Low cost ISP cant offer more space. Bar changing ISP is there a quick fix?

Tnxs
Bren

PS Hope everybody going to Galway has a great day out!