v8 s type

hi all just read all the above topics --very intresting u can learn alot from this site some helpfull people -i myself have a jaguar v8 4 litre petrol automatic---1999---86000 miles --im in love with itt- but 2 weeks ago i hit a problem --got in car at 8am in morning started engine --car was juddering & would nott settle smooth left it on tickover started making weird noises---so i turned engine off & left itt ---phoned a local jag specialist & he confirmed what id thought --timing chain tensioner had give way i think---so i got it on recovery & dropped it to him expecting the worst --after a day or 2--waiting which felt like weeks -he phoned me and told me he had stripped drivers side bank a i think?? that chain was ok --on passenger side after stripping the tensioner had fell apart--he warned me that now it was down to luck if had damaged any valves ?--so after a waiting game he replaced the tensioner for a metal one so he tells me --all back up & running he charged me 400-pounds all in i was very luck no damage was done----on phoning him back i asked about the driverssidetensioner he said upon checking it all looked ok -its the plastic one --so i ask how much to change this one he tells me 250.00 quid--i presume i should have had them both changed?? anyadvice appreciated--on oils for gearbox and so forth after reading all above comments its made me want to be sure my jag is bulletproof as its told of the v8 engine apart from the timing chain tensioners that is )