I have been given what to me is a very nice Scott triathlon bike circa 2000 vintage. It has aerobars with gripshifters and Shimano 105 groupset (if that's possible - it's what it says on the rear derailleur - I don't know what I'm talking about - sorry). Anyhow, my home is in London and despite myself I want to continue to live, so I would like to change the aerobars and gripshifters for flat bars and triggershifters to give me some chance of not being killed. Is this possible at reasonable cost? Someone suggested it might cost more than £400 - can this be true? Any advice much appreciated.