Do not use them. Especially if all the reviews are bad.

They were at my premises. Never completed the job and 3 days after they left it rained again and there was no difference before or after they finished, as it still kept on leaking.

They were quick to mail to get the rest of the of the funds, but they do not answer their phones to come and complete the job, not to honour their supposed guarantee. I guess the guarantee was never in place, as the work was never completed.

Paid a lot of money for nothing.