ROBERTS BP-R1 Radio Battery Pack £17.97 @ Currys

Clearance deal at Currys so check your local branch for details. I bought one of these for my Roberts R1 at a deal price of £30 - Roberts were selling them for £59.00 and Currys were OOS at £39.00.
Works really well and a nice flush fit with the R1, allowing you to unplug and take it anywhere - battery life is very good too - works with R100 too.
If you were put off buying one of these before because of the high price and a Currys near you has stock I’d recommend getting one at this price!
Available for delivery and in-store collection.