I’ve followed many kitchen threads on STW and did mine in lockdown 1. DIY kitchens were offering 10% off which made it very attractive. I would suggest going to their showroom to see the range but they do a refundable door and carcass sample service sent to your home. I used the online service before I went and asked for assistance and changes when I was in the showroom.
Worktop express was a good shout and a word of warning for anyone thinking about curved end cabinets is that it was a nightmare finding a laminate supplier to cut and supply with a radius curve. In retrospect I would have gone for a stone top and spent the money and saved time and hassle. I had a solid worktop before but found the oiling and maintenance a pain.
I would suggest getting ready assembled carcasses as you can install these prior to worktop fitter and save time and money. Level the bottom ones and hand the wall ones. I did ended up ordering more than I needed , boards and shelves which didnt fit ( forgot to take into account of pipework in the corner). All in all still cheaper than the wren complete fit quote by 50%. 1-2 days labour for kitchen fitter and a gas engineer to fit and certify the hob.