It doesn't matter if you're in Poland, the UK, the US, Brazil, Portugal, Spain, Germany, or anywhere else. As long as you use a high-quality VPN, you can play on bet365 from anywhere in the world.
Do all VPNs work with bet365? No, most VPNs don't work at all with bet365 if the site detects that you're using a VPN, it will deny you access to your account. So, you need to make sure you purchase a VPN that works with bet365 and also has servers in locations that work with bet365.