The lead time will depend on the nature of the work; for example we undertake to convert an existing ETA to a UKTA within two months, but other processes will of course have their own timescales. We would be pleased to quote for any specific work that you have in mind. If is product covered by a Designated Standard is not UKCA marked by the beginning of 2021, it would currently be illegal to place it on the market unless the transition period for CE marking is extended.