sorry to bring up ur pricing again but £250-£350 for the tank replacement still sounds way too much, i just bought a tank from euro car parts and was £117 including vat so fitting couldnt be £200 ? anyway its dun now. as for the rattling.. if its ur dash then as said b4 they do rattle a little, but have u tried the obvious, missing or loose screws on the dash mounting brackets ? they are a b@stard to locate and get to but this is also why the dont get checked or put back by garages. as its an old car u dont know how meny garages have looked at it b4. and unless a good garage has worked on it then they could of shifted it in and out quick, thats why alot of mk1 owners do there own work, or learn to.any noise comming from high speeds is because the roof doesnt insulate the outside noise as well as the hard tops, almost like driving with the window down abit, aswell as the resistance to airodynamics slightly. where du live anyway ? i could have a look and see if its normal... cheers, Dave P...