On 29 June, the source wrote (citation):

In line with the usual practice, the last base year and reference year for the chained volume estimates have moved forward one year from 2015 to 2016. [...]

In line with National Accounts Revisions Policy the entire time series within this release has been subject to revision. [...]

We have revised existing series and updated their unit-descriptor metadata. Properties are otherwise unchanged (see related article).

The data reside in the historical catalog (United Kingdom » National Accounts » Additional Detail » ONS - Detailed - National Accounts » Quarterly | Annual) and include, for example:

• ONSNAABMIQ.IGBR = Gross domestic product, (Mil. Ch. 2016 GBP, SA)
• ONSNAKGA3Q.IGBR = Expenditure - Food and drink, (% Ch. 2016 Q/Q, NSA)
• ONSNAKH5CA.IGBR = Gross trading profits - Private non-financial corporations, (% Y/Y)

Because catalog locations are subject to change, the upper-right search box on DataBuffet.com provides a "find in catalog" mode that accepts a mnemonic.