Money and budget are the pinnacles of all travel plans. If you are making your flight reservation and accommodations for your travel duration you ought to make parking arrangements, as well as official parking lots, are a nightmare for people travelling on a fixed budget.
Meet and greet at Heathrow is a reliable alternate to it for the following reasons:
As oppose to this, on-airport car parking is costly and requires entry and exit fees for even drop offs whereas Heathrow cheap airport parking deals does not. They are not very reliable and sometimes there are involuntary vehicle searches for apparent security reasons which are not very assuring in terms of vehicle safety of long term stays. Considering all these point you can decide for yourself which service is better for your budget and the safety of your car.