Previously I used AO and the experience was good, however this time I cannot say the same. The experience went from bad to worse too potentially catastrophic. Bad - we had a time slot allocated, which was not adhered too instead they were 2 hours late. Worse - they were not able to fit the product because they said there was an open valve pipe there. Potentially catastrophic - the engineer a "gas safe" registered engineer left this potentially life threatening open gas valve without getting in touch with the national grid, which in turn could of been life threatening. Once the Cadent engineer come he found the pipe to not be in use, which if this so called "gas safe" registered engineer had of done his due dillegance he would of been able to figure this out. Speculation - it seemed to me like this engineer did not want to do the job and just wanted to create a reason why not to do the job. Comparison - got a product from Curry's today; they come on time, did not try to get out of doing the job and also they were friendly and great assets to their respected company. Conclusion - go get your products from Curry's their team sure know how to look out for their customers