Meegs, your options for training and teaching Pedro correct recall outside are obviously very limited - so, why can't you do it inside?
You have a hallway? A wide open room that you can practice in?
Look, being out in the yard or at a park later to practice recall with distractions is fantastic and def the way to go, but I ALSO think constantly practising recall in little spurts throughout the hosue can also acheive a hell of a lot.
No long lead is needed inside the house. Just a plain walking lesh and some treats (if you train with treats, that is.) Recall can be started from scratch with Pedro again, starting at only a few paces away, branching out to the end of a leash, especially if you have a long 180cm leash. You can rpcatice by putting him into stay, or drop, and letting the leash go on the floor and backing down the hallway further a few steps etc...
All the frequent little recall things you can do inside at night after work with him all add up and will work wonders, Meegs. Especially when daylight savings hits us again and then you'll be more than ready to practice in parks and such with lots of distractions.