Interesting comments above .. but getting back to Elans ...original concern was about a trip from Bristol to London which Google maps tells me is about 120 miles.
Since January my 'Monday commute' to Slough is 130 miles, returning on Thursdays having usually done about 300 business miles in a week. Occasionally pull the dipstick to confirm no oil required and glance at coolant level but it's only for 'peace of mind'.
First SE was a '91 Collapso that I took to south of France for the '96 Monaco GP. Having just finished 3 night shifts, I got up late afternoon, threw a holdall in the boot and drove 130 miles to Dover for the ferry. Calais to Monaco was 770 miles done as a single blast apart from (frequent) fuel stops. Driving overnight I was virtually the only vehicle on the road, clear sky, big moon, cold damp air, Best of the Eagles CD playing and hood down. Péage signs said '130' so that's what I cruised at ..

(Not my fault they didn't say 'kph') Also found it uses less fuel with headlights down. Cruised into Monaco as the sun came up. France seemed quite small on that trip.
(The GP was a joke with failures and crashes everywhere and only 3 cars running at the finish.) Then 250 miles from Monaco to Cap d'Agde for a few days and then 700 miles to Calais and 130 from Dover to home. So almost 1900 miles on that trip. A nice 'long weekend' away.
I then used that SE on business in the midlands and doing around 600 a week. It went a long way past 100,000 miles and only items needed except service items were one set of gear-change cables and numerous sets of discs, pads and tyres.
Even though oldest are approaching 30 years old, properly maintained and used regularly, I can't see a problem with long journeys in them.