Many posts asking about Calor/LPG, suggest any one considering bottle or bulk gas, google calor/trustpilot. Says it all regarding delivery.
Also bear in mind you are tied into a two year contract with bulk supply,
dont know about bottles, This may sound o.k unless you signed the contract in the cold winter months, Your contract ends in the winter and calor, (my supplier) can keep your new supplier of choice (usually cheaper better terms) waiting for six weeks (by law) before they come around to signing the tank over to new supplier, During this time you usually run out of gas, got you over a barrel or more correctly Tank.