On Sunday, January 24, 2016 at 1:34:34 PM UTC, xmetman wrote:
Highest Air Temperature
Great Dun Fell might be a bit dodgy but Northolt should be believable

1300 UTC on Sunday, 24 January 2016
In WMO Block 03

[01] 03672 RAF Northolt 15.7 [60.3]
[02] 03227 Great Dun Fell 15.6 [60.1]
[03] 03770 London St James Park 15.4 [59.7]
[04] 03784 Gravesend-Broadness 14.9 [58.8]
03772 London Heathrow 14.9 [58.8]
[05] 03066 RAF Kinloss 14.8 [58.6]
[06] 03321 Hawarden 14.7 [58.5]
[07] 03658 RAF Benson 14.6 [58.3]
[08] 03839 Exeter Airport 14.4 [57.9]
03628 Filton 14.4 [57.9]
[09] 03707 RAF Chivenor 14.3 [57.7]
03522 Hereford 14.3 [57.7]
[10] 03166 Edinburgh Gogarbank 14.2 [57.6]
03649 RAF Brize Norton 14.2 [57.6]
[11] 03978 Finner 14.1 [57.4]
03962 Shannon 14.1 [57.4]
03907 Magilligan 14.1 [57.4]
[12] 03979 Ballyhaise, Cavan 14.0 [57.2]
03068 RAF Lossiemouth 14.0 [57.2]
03560 Thurleigh 14.0 [57.2]
[13] 03980 Malin Head 13.8 [56.8]
03901 Thomastown 13.8 [56.8]
03414 RAF Shawbury 13.8 [56.8]
[14] 03966 Gurteen 13.7 [56.7]
[15] 03768 Farnborough 13.6 [56.5]
03917 Belfast 13.6 [56.5]
03529 Pershore 13.6 [56.5]
03853 Yeovilton 13.6 [56.5]
03266 RAF Linton-On-Ouse 13.6 [56.5]
[16] 03265 Topcliffe 13.5 [56.3]
[17] 03660 High Wycombe 13.4 [56.1]
03544 Church Lawford 13.4 [56.1]
03351 Rostherne 13.4 [56.1]
[18] 03684 Braintree 13.3 [55.9]
03809 Culdrose 13.3 [55.9]
03969 Dublin 13.3 [55.9]
03535 Coleshill 13.3 [55.9]
03967 Casement 13.3 [55.9]
03313 Rhyl 13.3 [55.9]
03520 Shobdon 13.3 [55.9]
[19] 03261 RAF Dishforth 13.2 [55.8]
03257 RAF Leeming 13.2 [55.8]
03409 Bala 13.2 [55.8]
03462 RAF Wittering 13.2 [55.8]
03904 Castlederg 13.2 [55.8]
[20] 03385 Donna Nook 13.1 [55.6]
03862 Bournemouth 13.1 [55.6]
03970 Claremorris 13.1 [55.6]
03971 Mullingar 13.1 [55.6]
[21] 03503 Trawsgoed 13.0 [55.4]
03743 Larkhill 13.0 [55.4]
03961 Oak Park, Carlow 13.0 [55.4]
03923 Glenanne 13.0 [55.4]
03482 RAF Marham 13.0 [55.4]
[22] 03469 RAF Holbeach 12.9 [55.2]
03488 Weybourne 12.9 [55.2]
03916 Ballypatrick Forest 12.9 [55.2]
03693 Shoeburyness 12.9 [55.2]
03379 RAF Cranwell 12.9 [55.2]
[23] 03044 Altnaharra 12.8 [55.0]
03105 Islay 12.8 [55.0]
03749 Middle Wallop 12.8 [55.0]
03171 RAF Leuchars 12.8 [55.0]
03391 RAF Coningsby 12.8 [55.0]
03716 St Athan 12.8 [55.0]
03136 Prestwick(Royal) 12.8 [55.0]
03797 RAF Manston 12.8 [55.0]
03915 Portglenone 12.8 [55.0]
[24] 03746 Boscombe Down 12.7 [54.9]
03590 RAF Wattisham 12.7 [54.9]
03740 RAF Lyneham 12.7 [54.9]
03212 Keswick 12.7 [54.9]
03808 Camborne 12.7 [54.9]
03953 Valentia 12.7 [54.9]
03238 Albemarle 12.7 [54.9]
03354 Nottingham 12.7 [54.9]
03240 RAF Boulmer 12.7 [54.9]
[25] 03144 Strathallan 12.6 [54.7]
03377 RAF Waddington 12.6 [54.7]
03502 Aberporth 12.6 [54.7]
03382 Leconfield 12.6 [54.7]
[26] 03647 Little Rissington 12.5 [54.5]
03220 Carlisle 12.5 [54.5]
[27] 03761 RAF Odiham 12.4 [54.3]
03080 Aboyne 12.4 [54.3]
[28] 03155 Drumalbin 12.3 [54.1]
[29] 03803 Scilly 12.2 [54.0]
03346 Leeds 12.2 [54.0]
03827 Plymouth 12.2 [54.0]
03840 Dunkeswell 12.2 [54.0]
03047 Tulloch Bridge 12.2 [54.0]
03951 Sherkin Island 12.2 [54.0]
03973 Connaught 12.2 [54.0]
03976 Belmullet 12.2 [54.0]
[30] 03275 Loftus Samos 12.1 [53.8]

Easily a date record (yet again, this winter).