So, you have one car which you park on the driveway and a van which you park outside. No problem there then, except of course theoretically it is against the law to park partially on the pavement. Having said that and on looking out into the street I live in, if they did not park with two wheels on the pavement anything like fire engines would be unable to drive up the street,- could make problems. Do any of the others park their cars outside with wheels on the pavement, or are you the only one? Some people seem to think that the bit of road outside their house belongs to them. As long as you have paid your road tax I believe you can park anywhere, except for double yellow lines, access to people's driveways and outside of schools etc. As that doesn't seem to apply in your case the best thing to do is ignore them. Shame to be in conflict with your neighbours though as you have to live in close proximity to them.