A warning from one who learnt the hard way: take care not to short out the interior lighting circuit when changing the lining. It's quite easy to touch the bare end of the lucar connectors to the roof. In my case, as a result the car refused to start. Spent an hour in the pouring rain heaving it up a small slope back into the garage at midnight.
OK, so why wouldn't it start? Took an entire day before light dawned

. Turns out the after-market immobilizer fitted to the car was, you guessed it, powered off the interior light circuit. No lights meant about 10 relays isolated the fuel pump, ignition, engine management, starter, Uncle T Cobbley and all.