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thanks, so the answer is, get an electrician?
Yes
i was worried itd be too small a job for anyone to bother
Rewiring your lighting circuits with earthed cable may be a much bigger job than you expect. Doing a small 3 bedroom house took me and another guy 2 and a half days to do it, and we were lucky that we were able to pull most of the new cables in place when we pulled the old cables out and only had to chase one wall out.
Depending on the layout of the house, generally floorboards will need to come up and chases put in the walls to get new cables in. If your house is finished (ie not currently being renovated) it can be quite an involved process that requires an amount of redecorating afterwards.
thanks, so the answer is, get an electrician? i was worried itd be too small a job for anyone to bother