The short answer is, not yet. There are certain sectors where Brexit raises specific concerns e.g. in the context of financial services. For contracts between trading counterparties, however (whether in the context of the provision of goods or services), from a legal perspective relatively little has changed so far.
Clients are aware of broader commercial concerns, such as changed import/export formalities, potential tariffs, and the effect on their supply chains more broadly. It is usually appropriate to assess whether the jurisdiction of the English courts is likely to create any particular issues and, if necessary, consider alternatives to this – non-UK parties are increasingly sensitive to this issue.
Certain drafting considerations also apply – for example, to ensure that references to EU or EU-derived legislation cover the fact that, as matters currently stand, with effect from the end of the transition period (so after 11pm UK time on 31 December 2020), in most cases the legislation will continue to apply in the UK but as a body of retained law on a different statutory footing. We have however seen little appetite for specific “Brexit clauses” entitling a party to renegotiate agreements depending on the political agreement in place at the end of the transition period.
Counterparties from civil law jurisdictions (such as Italy) are not always aware that the English courts will continue to interpret strictly contractual obligations, and that it is strongly inadvisable to assume that the courts will deem Brexit an intervening event which entitles the parties to re-formulate their agreement, or deem the agreement modified because it has now become more onerous for one or both parties to perform.
In a climate of continued uncertainty as to the arrangements which will be in place from 1 January 2021, however (and perhaps with a degree of fatigue at the fact that they seem to have been through a “will it be x/will it be y” process several times already), parties often prefer to agree shorter contractual notice periods to terminate the agreement, and accept that there may be a degree of commercial risk for each party depending on the outcome of the current political negotiations.