|A bit of commonsense is called for here. The OP didn't say he was |*installing* (for the first time) a new cooker, just *replacing* his |existing one. He didn't say that he was refurbishing the whole kitchen and |so I assume that he will have to replace like-for-like and replace his |existing cooker with one of the same size in order to fit in the same hole |that the old one is vacating. | |In other words, he doesn't say that he's going to be replacing a four-ring, |single-oven, eye-level-grill cooker with an eight-ring, double-oven range |cooker or anything bigger than he's got now, so the supply pipe that has |happily supplied his old cooker for x-amount of years, and the ventilation, |and the clearances etc., etc., should all be OK - if they were OK to begin |with, of course. | |In the OPs case, you're still only talking about screwing one end of a |flexible pipe (making a gas-tight seal, of course) into the cooker and |pushing the other end into a bayonet fitting. Installation from scratch is, |of course, a different kettle of fish altogether and quite rightly so.
I as OP was doing a complete kitchen refurbishment, but while the new boiler was being installed, by a Corgi company I instructed them to fit a gas bayonet fitting in the appropriate place.