Electric cars make sense for a lot of people. However, with no home charging available and regular trips abroad, you’d have to be really dedicated to running an electric car for 30k a year. We’d recommend sticking with a modern diesel for your mileage. No matter which route you go down, any car’s going to depreciate rapidly if you add 30k a year (hence high lease costs). The only way to avoid this is to run an older model like your C5 but, as you’re probably finding, that’ll result in higher maintenance costs. I’d look for a frugal diesel like a modern Skoda Octavia, Kia Ceed or Ford Focus. You could consider a hybrid but fuel costs will be expensive – hybrids are at their best around town.