This apparently may be an issue in the future according to the dealer and as it's not under warranty they will charge me £300 or so to replace.

Anyone know the correct make and spec to go for and where's best to get one? I'm sure this can be done at home right, as long as I follow the Wiki instructions on how to remove. Discovery 4 HSE
1998 110 TUM HS FFR Hard Top XD WOLF
1982 Series 3 Hard Top

*Gone:L462 D5 HSE LUX, L663 Defender 110 HSE, Discovery 3 HSE, 2014MY Range Rover Sport 5.0 Supercharged AB Dynamic; L405 Exec Vogue SE 4.4, 5.0 Supercharged Autobiography, Defender TDCi XS CSW, Defender TD5 HT, Vogue SE TDV8, Vogue TD6, RRSport SC 4.2V8, Classic 3.9 Vogue Auto, Land Rover Series 3 SWB

I'm guessing it's this one as it seems the highest rated...

http://www.eurocarparts.com/ecp/c/Land+Rov...amp;000020 Discovery 4 HSE
1998 110 TUM HS FFR Hard Top XD WOLF
1982 Series 3 Hard Top

*Gone:L462 D5 HSE LUX, L663 Defender 110 HSE, Discovery 3 HSE, 2014MY Range Rover Sport 5.0 Supercharged AB Dynamic; L405 Exec Vogue SE 4.4, 5.0 Supercharged Autobiography, Defender TDCi XS CSW, Defender TD5 HT, Vogue SE TDV8, Vogue TD6, RRSport SC 4.2V8, Classic 3.9 Vogue Auto, Land Rover Series 3 SWB

and even cheaper on eBay

http://www.ebay.co.uk/itm/Type-020-110Ah-9...43cc581ec7

Is the Bosch S5 okay? Discovery 4 HSE
1998 110 TUM HS FFR Hard Top XD WOLF
1982 Series 3 Hard Top

*Gone:L462 D5 HSE LUX, L663 Defender 110 HSE, Discovery 3 HSE, 2014MY Range Rover Sport 5.0 Supercharged AB Dynamic; L405 Exec Vogue SE 4.4, 5.0 Supercharged Autobiography, Defender TDCi XS CSW, Defender TD5 HT, Vogue SE TDV8, Vogue TD6, RRSport SC 4.2V8, Classic 3.9 Vogue Auto, Land Rover Series 3 SWB

Strangely the ebay trader is Eurocarparts in disguise

Eurocarparts also sell on eBay under their name, also cheaper than their web page, going rate seems to be about £113.

Weird thing is the vehicle compatibility checkers all seem to say it's not compatible....  Discovery 4 HSE
1998 110 TUM HS FFR Hard Top XD WOLF
1982 Series 3 Hard Top

*Gone:L462 D5 HSE LUX, L663 Defender 110 HSE, Discovery 3 HSE, 2014MY Range Rover Sport 5.0 Supercharged AB Dynamic; L405 Exec Vogue SE 4.4, 5.0 Supercharged Autobiography, Defender TDCi XS CSW, Defender TD5 HT, Vogue SE TDV8, Vogue TD6, RRSport SC 4.2V8, Classic 3.9 Vogue Auto, Land Rover Series 3 SWB

I thought that was the standard replacement battery for Fatties?
I paid less an £100 for mine about 18 months ago using a 25% MB Club discount code and there were other codes being bandied around at the time that offered similar discounts.
euro often push out their own codes to use, they are the DFS of car bits

The correct spec is a 850A AGM 90Ah battery

The battery monitoring system will require resetting after replacing the battery.