I’m a bit confused, if the kitchen is going in today surely it won’t fit the base unit and you’ll throw your whole design out? Or do you mean finalise the design? By tray, do you mean the grill pan or the oven racks which come with the oven? I’ve taken a photo from their website re what size baking trays fit

The ambia line is for the legra drawer boxes, which is quite new to the UK market and is a more expensive drawer than the standard blum antaro tandem box drawer, my carcase manufacturer has advised me in the past that their standard cutlery tray also suits the legra box, so I have cheaper cutlery trays that are in anthracite and 423 and 473mm deep and the width is 86mm less than the cabinet ie to suit a 900 wide drawer the cutlery tray is 814mm and they come with dust strips. They also have a knife block and spice jar inserts. But for all the other elemants than I think you may need to stick to the ambia line but depends on what you are after, also worthwhile shopping around as on line suppliers may be cheaper than a showroom price.

Anything ordered from a company online can be returned within 28 days (check B&Q returns policy) without a reason. You usually have 14 to advise them of a return then another 14 days to actually return it. This is from date of receipt of item. If an item is not how you expected, Distance Selling Laws state you can return it and get a refund. It’s the law as you are buying unseen. I know you probably don’t want the faff but you can return it to the store if that is easier, rather like you do with clothes.

I don't think it's boring at all but then I am virtually allergic to "pops of colour", "colour drenching" whatever you want to call it. I'm no wallpaper fan either except for the odd pattern. If your house is modern I think a single colour would suit it better at least to start with. You can always change the colour of particular spaces later as you get a feel for the light and how it moves around the space. It also depends on what style you choose.