Latest stats out from the BOE

This monthly release shows details of movements in the UK's official holdings of international reserves, or assets. These consist of gold, foreign currency assets and International Monetary Fund assets.

Full details from the BOE site here

UK Treasury dept has this as well by way of further background

I'm still going through the small print but I don't see anything of note so far. The HMT report states no intervention operations were undertaken.

Don't be surprised though if a bit of "smoothing is taking place to take advantage of these high TWI-based GBP levels