The 1.4i engine generates only 82 BHP, in comparison to 138 BHP for the 1.8i engine. But you will need to consider the difference of £50 in annual road tax, plus very likely a bigger differential in insurance premium.
At 138 BHP, the Civic is likely to have a similar power to weight ratio as your 2.2 turbo diesel (unless it was a similarly sized vehicle).
So all things being equal, go for the 1.8i unless the extra £50 per year plus the insurance differential is too much to bear.