YANBU
Do not deal with them. We agreed to let them come and quote when I was doorstepped, as we were gathering quotes from a few places. They called to check that DH would be there, ostensibly for safety, but in reality it is so they can pressure sell you without you using 'I need to talk it through with DH and get back to you' as an excuse.
The rep came to our house at about 7pm and would not leave until 11pm. Seriously. He pulled a made up bolloxy quote out of his arse, that made no sense and was more expensive than other places, as a special, limited time only deal. We told him (as I'd told the door person and the guy on the telephone) that we were only collecting quotes as we had to wait until the insurance company had finished a claim on the house and that could be months away from finishing.
He still tried to hard sell for that night. DH told him that he'd talked himself out of any possible custom from us and yet he wouldn't go. He stood in our kitchen for about 45mins in silence, until DH nearly had to bodily move him.
Once the insurance work was done, we went to a local company down the road who were so friendly, polite, helpful, fairly priced and delivered a fantastic service.
Avoid Anglian like the plague.