Sirius, it takes about 20 - 30 mins from the home depending on how fast you walk.
If you head down Penarth Road, past the pump house, take the right turn onto the Ely trail and follow it until you reach the mound. You can then either go up over the hill (if it is muddy this can be a little slippy on the way down the other side) or take the path around to the left and you will be at the Cardiff Bay retail park and should see Pets at Home.
If my directions don't make sense there will be someone about at the home to ask or there may even be others going that way you can walk with
Im still happy to get there to help with setting up, table in car all ready, will try and bring some fold up chairs too. Thanks Lynne for messaging me Becky, is Zac still coming? Excuse that funny little man, can't get rid of him lol xx