Epilogue:
Insurance returned laptop. Installed my new memory again only to find it didnt work again. After wtf moment I installed it in the second slot and bingo! Up and running. Its been in daily use for about six weeks and hasnt missed a beat. Wrote to Toshiba's repair centre with a printout from the onboard diagnostics showing all OK. They rang me today asking for my card details so they can give me my money back. (Note to self: write down what I've done - must have forgotten to try the second slot first time round) Full time score: Tiger 1 Toshiba 0
Oct '00 E46 330i. Feb '92 525i (departed)